Two army persons A and B each of weight of 500 N climb up a rope through a height of 10 m. -Physics 9th

Two army persons A and B each of weight of 500 N climb up a rope through a height of 10 m. -Physics 9th
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Two army persons A and B each of weight of 500 N climb up a rope through a height of 10 m. A takes 20 s while B takes 40 s to achieve this task. -Physics 9th

Description : Two army persons A and B each of weight of 500 N climb up a rope through a height of 10 m. A takes 20 s while B takes 40 s to achieve this task. -Physics 9th

Last Answer : The ratio of powers of A and B = 2: 1 Explanation : Where , Fa = 500N S = 10m Fb = 500N ta = 20s , tb = 40s

two persons a and b each of weight 500 n climb up a rope through a height of 10 m . a takes 20 s while b takes 40 s to achieve this task . what is the ratio of powers of a and b ? -Physics 9th

Description : two persons a and b each of weight 500 n climb up a rope through a height of 10 m . a takes 20 s while b takes 40 s to achieve this task . what is the ratio of powers of a and b ? -Physics 9th

Last Answer : The ratio of powers of A and B = 2: 1 Explanation : Where , Fa = 500N S = 10m Fb = 500N ta = 20s , tb = 40s

Two army persons A and B each of weight of 500 N climb up a rope through a height of 10 m. A takes 20 s while B takes 40 s to achieve this task. What is ratio of the powers of person A and B? -Physics

Description : Two army persons A and B each of weight of 500 N climb up a rope through a height of 10 m. A takes 20 s while B takes 40 s to achieve this task. What is ratio of the powers of person A and B? -Physics

Last Answer : The ratio of powers of A and B = 2: 1 Explanation : Where , Fa = 500N S = 10m Fb = 500N ta = 20s , tb = 40s Image solution

two army person a and b each of weight -Physics 9th

Description : two army person a and b each of weight -Physics 9th

Last Answer : The ratio of powers of A and B = 2: 1 Explanation : Where , Fa = 500N S = 10m Fb = 500N ta = 20s , tb = 40s

Find the energy possessed by an object of mass 10 kg when it is at a height of 2 m above the ground. Given, g = 10 m/s2 -Physics 9th

Description : Find the energy possessed by an object of mass 10 kg when it is at a height of 2 m above the ground. Given, g = 10 m/s2 -Physics 9th

Last Answer : Given, Mass of object m=10kg. Height h=6m. Acceleration due to gravity g=9.8m/s2 Potential Energy of object P.E=m×g×h ⇒mgh=10×9.8×6=98×6 =588J Energy possessed by the object is 588Joule.

An object with 100 N weights is raised to a height of 15m. Find the potential energy possessed by the object at that height. Also find the new potential energy: -Physics 9th

Description : An object with 100 N weights is raised to a height of 15m. Find the potential energy possessed by the object at that height. Also find the new potential energy: -Physics 9th

Last Answer : Potential Energy is given by PE=mgHPE=mgH Given mg=100N and H=15 m PE=100 15=1500JPE=100 15=1500J If If the same object is raised half of its original height i.e H= 7.5 m PE=100 7.5=750JPE=100 ... same object is raised to three times of its original height i.e H=45 m PE=100 45=4500JPE=100 45=4500J

A force of 10 N displaces a body by a distance of 3 m at an angle 60° to its own direction. Find the amount of work done. -Physics 9th

Description : A force of 10 N displaces a body by a distance of 3 m at an angle 60° to its own direction. Find the amount of work done. -Physics 9th

Last Answer : F=10N,S=2m,θ=600 So, Work=F×Scosθ=10×2cos600 =10×2×21​=10J

An engineer is asked to design a playground slide such that the speed a child reaches at the bottom does not exceed 4.0 m/s. Determine the maximum height that the slide can be.?Given, g = 9.8 m/s2. -Physics 9th

Description : An engineer is asked to design a playground slide such that the speed a child reaches at the bottom does not exceed 4.0 m/s. Determine the maximum height that the slide can be.?Given, g = 9.8 m/s2. -Physics 9th

Last Answer : Entire PE is converted to KE when the child reaches bottom So KE = PE 12mv2=mgH12mv2=mgH or H=v22g=162×9.8=.816mH=v22g=162×9.8=.816m

Calculate the power of an electric motor that can lift 800 kg of water to store in a tank at a height of 1500cm in 20s -Physics 9th

Description : Calculate the power of an electric motor that can lift 800 kg of water to store in a tank at a height of 1500cm in 20s -Physics 9th

Last Answer : The power of an electric motor to store the water is 6000 W. Given m= 800 kg, h = 1500 cm = 15 m, g = 10 m/s^2 and t = 20 s. W = 120000 J. P = 6000 W. Thus, the power of an electric motor to store the water is 6000 W.Apr 6, 2016

An object of mass m and velocity v has kinetic energy= 200J. Find the new kinetic energy if the mass of the object becomes double and velocity still remains the same? -Physics 9th

Description : An object of mass m and velocity v has kinetic energy= 200J. Find the new kinetic energy if the mass of the object becomes double and velocity still remains the same? -Physics 9th

Last Answer : let the k.e. in first case be x x = 1/2*m*v^2=200j in second case let the kinetic energy be x' v'=v m'=2m x'= 1/2*2m*v^2 x'= 2(1/2*m*v^2) x'=2(x) x'=2*200j x'=400j

Certain force acting on a 20 Kg mass changes its velocity from 5 m/s to 2 m/s. Calculate the work done by the force ? -Physics 9th

Description : Certain force acting on a 20 Kg mass changes its velocity from 5 m/s to 2 m/s. Calculate the work done by the force ? -Physics 9th

Last Answer : Certain force acting on 20 kg mass changes its velocity from 5 m s-1 to 2 m s-1. Calculate the work done by the force. (E k)2 = (1 )/2x 20 — (2)2 = 40 J.

How is work and energy related to each other? -Physics 9th

Description : How is work and energy related to each other? -Physics 9th

Last Answer : Work results when a force acts upon an object to cause a displacement. The Energy is capacity for doing work. It may exist in potential, kinetic, thermal, electrical, chemical, nuclear, or other various forms. ... shares the same units of measure as work. The SI unit of work or energy is the joule.

A rocket is moving up with a velocity v. If the velocity of this rocket is suddenly tripled, what will be the ratio of two kinetic energies? -Physics 9th

Description : A rocket is moving up with a velocity v. If the velocity of this rocket is suddenly tripled, what will be the ratio of two kinetic energies? -Physics 9th

Last Answer : hope its clear

Give reason how will the force of attraction between two bodies changes if -Physics 9th

Description : Give reason how will the force of attraction between two bodies changes if -Physics 9th

Last Answer : Therefore when the distance between the objects is reduced to half, then the force of gravitation increases by four times the original force.

An electric heater of 1000 W is used for two hours in a day? What is the cost of using it for a month of 28 days, if one unit costs 3.00 rupees? -Physics 9th

Description : An electric heater of 1000 W is used for two hours in a day? What is the cost of using it for a month of 28 days, if one unit costs 3.00 rupees? -Physics 9th

Last Answer : energy consumed by heater of 1000W for 2h in one day=1000/1000×2 =2units number of units=W×h×day/1000 energy consumed by heater in 28 day 2×28=56units cost of 1unit =RS 3 cost of 56unit=3×56=RS 168

can average speed of a moving object be zero -Physics 9th

Description : can average speed of a moving object be zero -Physics 9th

Last Answer : Answer : No Explaination Speed is the distance travelled in the given time. Distance can never be zero. Therefore, average speed will always be a positive value and will not be zero. Speed is a scalar quantity and has only magnitude.

Obtain a relation for the distance travelled by an object moving with a uniform acceleration in the interval between 4th and 5th seconds -Physics 9th

Description : Obtain a relation for the distance travelled by an object moving with a uniform acceleration in the interval between 4th and 5th seconds -Physics 9th

Last Answer : Uniform acceleration in the interval between 4th and 5th seconds = = (5u + 1/2 * a * 5^2) - (4u + 1/2 * a * 4^2) = 5u + 1/2 *a * 25 - 4u + 1/2 * a * 16 = u + 1/2 * a * (25-16) = u + 1/2 * a * 9 = u + 9/2 * a If it starts from rest then the displacement will be 9/2a. hope this helps!

ncert exemplar class 9th science pdf -Physics 9th

Description : ncert exemplar class 9th science pdf -Physics 9th

Last Answer : matter in our surroindings Which one of the following sets of phenomena would increase on raising the temperature? (a) Diffusion, evaporation, compression of gases (b) Evaporation, compression of gases, solubility ... Pressure (i) cubic metre (b) Temperature (ii) kilogram (c) Density (iii) pascal

Can non uniform linear motion be accelerated ? -Physics 9th

Description : Can non uniform linear motion be accelerated ? -Physics 9th

Last Answer : Yes, the statement is correct. In a uniform linear motion, there is no change in the magnitude or direction i.e., velocity is constant, hence there will be no acceleration. Further, in a ... motion, the direction of motion changes at each point.. Hence, the uniform circular motion is accelerated.

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Description : Best Mind Map or Flow Chart of sound Ch -14 class 9th Physics -Physics 9th

Last Answer : NEED ANSWER

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Description : Best Mind Map or Flow Chart of work, energy and power Ch -13 class 9th Physics -Physics 9th

Last Answer : NEED ANSWER

An electric bulb of 100 W is used for 8 h per day. Calculate the 'units' of energy consumed in one day by the bulb? -Physics 9th

Description : An electric bulb of 100 W is used for 8 h per day. Calculate the 'units' of energy consumed in one day by the bulb? -Physics 9th

Last Answer : Given : t=6 hrs P=0.06 kW Thus energy consumed per day is: E=Pt=0.06×6=0.36 kWh=0.36 units

When the force acts at right angle to the direction of motion, what is the work done by the force -Physics 9th

Description : When the force acts at right angle to the direction of motion, what is the work done by the force -Physics 9th

Last Answer : Let F is the force applied and s is the displacement produce and the angle between force and displacement is θ The work done by this force is given as FW = Fs Cosθ Its unit is joule

If the mass of the body is doubled and velocity is made halved, the kinetic energy will become? -Physics 9th

Description : If the mass of the body is doubled and velocity is made halved, the kinetic energy will become? -Physics 9th

Last Answer : New kinetic energy becomes, So, the new kinetic energy of the object gets doubled.

If energy is neither created nor destroyed then from where do we get energy? -Physics 9th

Description : If energy is neither created nor destroyed then from where do we get energy? -Physics 9th

Last Answer : The first law of thermodynamics, also known as Law of Conservation of Energy, states that energy can neither be created nor destroyed; energy can only be transferred or changed from one form to another. ... on a light would seem to produce energy; however, it is electrical energy that is converted.

State and explain one example where kinetic energy is present in a body and is used -Physics 9th

Description : State and explain one example where kinetic energy is present in a body and is used -Physics 9th

Last Answer : (i) Kinetic energy is the energy present in a body by virtue of its motion. When water is stored in a dam at particular height, we say it has maximum potential energy as the water ... potential energy is stored in the water which transforms into kinetic energy when it released from that height.

Explain the Law of conservation of energy with pendulum. -Physics 9th

Description : Explain the Law of conservation of energy with pendulum. -Physics 9th

Last Answer : Law of conservation of energy state that energy can neither be created nor be destroyed it can only be converted into one form to another form. Now, let us consider a pendulum in which to ... pendulum to overcome the friction is gained by surrounding, So total energy of system will remain conserved.

Derive the formula for potential energy. -Physics 9th

Description : Derive the formula for potential energy. -Physics 9th

Last Answer : Potential energy is the energy possessed by the body by virtue of its position or configuration. Consider a body of mass m at a height 'h' from the ground. The amount of work done to raise this body to this height h against the force of gravity: W=F×h where F is the force of gravity . W=mgh

A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the kinetic energy of the car -Physics 9th

Description : A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the kinetic energy of the car -Physics 9th

Last Answer : The kinetic energy becomes 16 time that of initial kinetic energy Final speed = 4 times of initial speed The kinetic energy of car Where, m = mass of car v = initial velocity of car ... of initial velocity, then kinetic energy Hence, The kinetic energy becomes 16 time that of initial kinetic energy

What would you say to someone who had 10 seconds left to climb a 15 foot rope to finish an obstacle course?

Description : What would you say to someone who had 10 seconds left to climb a 15 foot rope to finish an obstacle course?

Last Answer : “I’m setting fire to the bottom of this rope. The fire will engulf the entire rope within 11 seconds.”

A rope of weight 0.5 kg/m hangs from a drum for a height of 6 m. The work done in winding up the rope will be a.9 kg-m b.3 kg-m c.12 kg-m d.18 kg-m e.6 kg-m

Description : A rope of weight 0.5 kg/m hangs from a drum for a height of 6 m. The work done in winding up the rope will be a.9 kg-m b.3 kg-m c.12 kg-m d.18 kg-m e.6 kg-m

Last Answer : a. 9 kg-m

An electric motor drives a windless which hauls up a crate A of weight W = 500 kg up an inclined plane through a height of 10 m in 2 minutes. The torque acting on the windless is 25 kgm and the drum of the windless makes 30 rpm. The efficiency of the inclined plane would be a.0.41 b.0.61 c.0.265 d.0.5305 e.0.66

Description : An electric motor drives a windless which hauls up a crate A of weight W = 500 kg up an inclined plane through a height of 10 m in 2 minutes. The torque acting on the windless is 25 kgm and the drum of the ... The efficiency of the inclined plane would be a.0.41 b.0.61 c.0.265 d.0.5305 e.0.66

Last Answer : d. 0.5305

Do girls get that "funny feeling" when they climb the rope in gym class?

Description : Do girls get that "funny feeling" when they climb the rope in gym class?

Last Answer : An old mortal enemy acquaintance of mine used to claim that she had an orgasm from climbing the rope. This was in middle school.

How to Climb a Rope

Description : How to Climb a Rope

Last Answer : How to Climb a Rope Climbing a rope may look difficult at first but it can be done easily if you know the basic techniques. Rope climbing is usually done during gym class. Some do it ... safety should be prioritized so place a soft support mat underneath the rope to have security and protection.

A 5 m ladder of mass 25 kg is placed in a position where its inclination to a vertical wall is at 30?. A 100 kg man is to climb the ladder. If the coefficient of static friction is 0.25 the height along ladder at which the slipping will be induced would be a.2.4 m b.1.6 m c.0.8 m d.1.2 m e.0.5 m

Description : A 5 m ladder of mass 25 kg is placed in a position where its inclination to a vertical wall is at 30?. A 100 kg man is to climb the ladder. If the coefficient of static friction is 0.25 the height along ladder at which the slipping will be induced would be a.2.4 m b.1.6 m c.0.8 m d.1.2 m e.0.5 m

Last Answer : c. 0.8 m

The breaking strength of a rope is 400 N. A fireman weighing 60 kg slides down the rope. The rope will break if a.107 dynes b.the acceleration is 7.5 m/s2 c.the acceleration is 1.2 m/s2 d.the acceleration is 3.1 m/s2 e.the slides with an acceleration of 15 m/s2

Description : The breaking strength of a rope is 400 N. A fireman weighing 60 kg slides down the rope. The rope will break if a.107 dynes b.the acceleration is 7.5 m/s2 c.the acceleration is 1.2 m/s2 d.the acceleration is 3.1 m/s2 e.the slides with an acceleration of 15 m/s2

Last Answer : c. the acceleration is 1.2 m/s2

In a construction site, a crane lifts 1000 kg of concrete mix to roof top at a height of 20 meters in 50 seconds. If the value of gravity 'g' due to earth is 10 m s-2, the power of elevator will be. -Physics

Description : In a construction site, a crane lifts 1000 kg of concrete mix to roof top at a height of 20 meters in 50 seconds. If the value of gravity 'g' due to earth is 10 m s-2, the power of elevator will be. -Physics

Last Answer : 4 KW (kilowatt)

A 3.2 m diameter balloon is filled with Helium. The total weight of balloon, gas and pay load is 10 kg kg. In an isothermal atmosphere having conditions identical to N.T.P. the balloon will rise to a height of about a.6000 m b.1500 m c.3000 m d.2000 m e.1000 m

Description : A 3.2 m diameter balloon is filled with Helium. The total weight of balloon, gas and pay load is 10 kg kg. In an isothermal atmosphere having conditions identical to N.T.P. the balloon will rise to a height of about a.6000 m b.1500 m c.3000 m d.2000 m e.1000 m

Last Answer : a. 6000 m

In Joule's experiment, an insulated container contains 20 kg of waterinitially at 25°C. It is stirred by an agitator, which is made to turn by aslowly falling body weighing 40 kg through a height of 4 m. The process isrepeated 500 times. The acceleration due to gravity is 9.8 ms-2. Neglectingthe heat capacity of agitator, the temperature of water (in °C) is(A) 40.5(B) 34.4(C) 26.8(D) 25

Description : In Joule's experiment, an insulated container contains 20 kg of waterinitially at 25°C. It is stirred by an agitator, which is made to turn by a slowly falling body weighing 40 kg through a height of 4 m. The process is repeated ... temperature of water (in °C) is (A) 40.5 (B) 34.4 (C) 26.8 (D) 25

Last Answer : (B) 34.4

Five persons M, N, O, P and Q request a bank for safety lockers. There are only 6 lockers available which are numbered from 52 to 57. The conditions are as follows: I. M’s locker number is 2 less than O’s lockers number. II. Lockers of N and P are next to each other. If N’s locker number is 52 then M’s locker number could be a) 52 or 53 only b) 53 or 54 only c) 54 or 55 only d) 53 or 55 only

Description : Five persons M, N, O, P and Q request a bank for safety lockers. There are only 6 lockers available which are numbered from 52 to 57. The conditions are as follows: I. M's locker number is 2 less than O's lockers ... could be a) 52 or 53 only b) 53 or 54 only c) 54 or 55 only d) 53 or 55 only

Last Answer : c) 54 or 55 only

Five persons M, N, O, P and Q request a bank for safety lockers. There are only 6 lockers available which are numbered from 52 to 57. The conditions are as follows: I. M’s locker number is 2 less than O’s lockers number. II. Lockers of N and P are next to each other. 14. If Q’s locker number is 54 and N’s locker number is greater than Q’s locker number, then which locker number is not allocated? a) locker 52 b) locker 53 c) locker 54 d)locker 56

Description : Five persons M, N, O, P and Q request a bank for safety lockers. There are only 6 lockers available which are numbered from 52 to 57. The conditions are as follows: I. M's locker number is 2 less ... , then which locker number is not allocated? a) locker 52 b) locker 53 c) locker 54 d)locker 56

Last Answer : a) locker 52

I am 18 years old. Height 5 feet 6 inches Weight 52 kg. I am studying in Inter 2nd year. I got 3.39 from science department in SSC. Will I get a job in the army now ? I am 18 years old. Height 5 feet 6 inches Weight 52 kg. I am studying in Inter 2nd year. I got 3.39 from science department in SSC. W

Description : I am 18 years old. Height 5 feet 6 inches Weight 52 kg. I am studying in Inter 2nd year. I got 3.39 from science department in SSC. Will I get a job in the army now ? I am 18 years old. Height 5 ... in Inter 2nd year. I got 3.39 from science department in SSC. Will I get a job in the army now ?

Last Answer : A minimum GPA of 3.50 is required to join the army as well as other qualifications. You can't even apply for this point in your SSC . If you get 3.50 or more in HSC exam and have other qualifications, you can apply for the post of Army soldier. Thank you!

I am 18 years old. Height 5 feet 6 inches Weight 52 kg. I am in Inter 1st year. I got 3.22 from business department in SSC. Will I get a job in the army now ? I am 18 years old. Height 5 feet 6 inches Weight 52 kg. I am in Inter 1st year. I got 3.22 from business department in SSC. Am I in the army

Description : I am 18 years old. Height 5 feet 6 inches Weight 52 kg. I am in Inter 1st year. I got 3.22 from business department in SSC. Will I get a job in the army now ? I am 18 years old. Height 5 feet 6 ... 52 kg. I am in Inter 1st year. I got 3.22 from business department in SSC. Am I in the army now?

Last Answer : Yes brother you can apply , now people are being recruited in GPA-3.000 in army. However, your height is low. So try to increase. Thank you!

An aircraft climbs from an airfield, elevation 1500ft, QNH 1023mb, to FL75. What height does the aircraft have to climb? (Assume 1mb=30ft) a. 6600 ft b. 7800 ft c. 6300 ft d. 6000 ft

Description : An aircraft climbs from an airfield, elevation 1500ft, QNH 1023mb, to FL75. What height does the aircraft have to climb? (Assume 1mb=30ft) a. 6600 ft b. 7800 ft c. 6300 ft d. 6000 ft

Last Answer : c. 6300 ft

An aircraft climbs from an airfield, elevation 1500ft, QNH 1023mb, to FL75. What height does the aircraft have to climb? (Assume 1mb=30ft) a. 6600 ft b. 7800 ft c. 6300 ft d. 6000 ft

Description : An aircraft climbs from an airfield, elevation 1500ft, QNH 1023mb, to FL75. What height does the aircraft have to climb? (Assume 1mb=30ft) a. 6600 ft b. 7800 ft c. 6300 ft d. 6000 ft

Last Answer : c. 6300 ft

The monthly incomes of two persons are in the ratio 5 : 4 and their monthly expenditures are in the ratio 9 : 7. If each person saves Rs. 500 per month, then what are their monthly incomes? a) Rs 8000 and Rs 10000 b) Rs 3750 and Rs 3000 c) Rs 5000 and Rs 4000 d) Rs 4500 and Rs 4000 e) None of the above

Description : The monthly incomes of two persons are in the ratio 5 : 4 and their monthly expenditures are in the ratio 9 : 7. If each person saves Rs. 500 per month, then what are their monthly incomes? a) Rs 8000 and Rs ... Rs 3750 and Rs 3000 c) Rs 5000 and Rs 4000 d) Rs 4500 and Rs 4000 e) None of the above

Last Answer : Let the incomes of two persons be 5x and 4x let the expenditures of them be 9y and 7y Each person saves Rs. 500 Therefore, 5x - 9y = 500 4x - 7y = 500 Solving the above equations, 20x - 36y = 2000 20x - ... = 500 + 9(500) = 5000 X = 1000 Hence, their salaries are Rs. 5000 and Rs. 4000 Answer: c)

If a rock weighing 2200 N is dropped from a height of 15 m what is its KE just before it hits the ground Remember weight is measured in newtons (N) and is equal to mass times gravity.?

Description : If a rock weighing 2200 N is dropped from a height of 15 m what is its KE just before it hits the ground Remember weight is measured in newtons (N) and is equal to mass times gravity.?

Last Answer : 33,000 J

A portion of an embankment having a uniform up-gradient 1 in 500 is circular with radius 1000 m of the centre line. It subtends 180° at the centre. If the height of the bank is 1 m at the lower end, and side slopes 2:1, the earth work involved. (A) 26,000 m3 (B) 26,500 m3 (C) 27,000 m3 (D) 27,500 m

Description : A portion of an embankment having a uniform up-gradient 1 in 500 is circular with radius 1000 m of the centre line. It subtends 180° at the centre. If the height of the bank is 1 m at the lower end, and side slopes 2 ... earth work involved. (A) 26,000 m3 (B) 26,500 m3 (C) 27,000 m3 (D) 27,500 m

Last Answer : (D) 27,500 m3

A man pulls a cart with 100 N force from rest with an acceleration of 10 m/sec2 for 10 seconds. The work done by him is a.500 KJ b.50.96 KJ c.101.92 KJ d.None of the above e.Tapered bearing

Description : A man pulls a cart with 100 N force from rest with an acceleration of 10 m/sec2 for 10 seconds. The work done by him is a.500 KJ b.50.96 KJ c.101.92 KJ d.None of the above e.Tapered bearing

Last Answer : a. 500 KJ

If a gas absorbs `200J` of heat and expands by `500 cm^(3)` against a constant pressure of `2 xx 10^(5) N m^(-2)`, then the change in internal energy

Description : If a gas absorbs `200J` of heat and expands by `500 cm^(3)` against a constant pressure of `2 xx 10^(5) N m^(-2)`, then the change in internal energy

Last Answer : If a gas absorbs `200J` of heat and expands by `500 cm^(3)` against a constant pressure of `2 xx 10^(5) N ... . `-100 J` C. `+100 J` D. None of these