Description : The velocity of a ball tossed vertically into the air is expressed by the equation v(t) = -32t + 4, where t is given in seconds. Give the velocity of the ball when it reaches its highest point.
Last Answer : ANSWER: 0
Description : If a bomb is released from a plane moving with uniform velocity, then by the time the bomb reaches the ground, the plane will be (a) Vertically above the bomb (b) Ahead of the bomb (c) Behind the bomb (d) Ahead or behind, depending on its velocity
Last Answer : Ans:(a)
Description : A particle is thrown vertically upward. When it reaches the highest point, it has – (1) a downward acceleration (2) an upward acceleration (3) a downward velocity (4) a horizontal velocity
Last Answer : (1) a downward acceleration Explanation: When a particle is thrown vertically upwards in space, it will experience constant acceleration towards the ground (irrespective of the direction in which it ... point, it has zero velocity but has downward acceleration equal to acceleration due to gravity.
Description : A particle is thrown vertically upward. When it reaches the highest point, it has (1) a downward acceleration (2) an upward acceleration (3) a downward velocity (4) a horizontal velocity
Last Answer : a downward acceleration
Description : When falling object reaches terminal velocity, the net force acting on it is?
Last Answer : When an object is not accelerating or decelerating, it has a net force of zero.
Description : What is the answer to this riddle He said it to his sisters he said to his brothers what did the pretty raindrop explain to all the others?
Last Answer : Need answer
Description : A ball thrown vertically upwards from a point P on earth reaches a point Q and returns back to earth striking at a point R.
Last Answer : A ball thrown vertically upwards from a point P on earth reaches a point Q and returns back to ... the motion of the ball (Neglect air resistance).
Description : A girl throws a 2 kilogram rock vertically upward. It reaches a maximum height of 5 meters. What is the kinetic energy of the rock the instant it leaves the girl's hand?
Last Answer : ANSWER: 100 JOULES (accept 98 joules)
Description : A helicopter is ascending vertically with a constant speed of 6 meters per second relative to the ground. At the instant the helicopter is 60 meters above the ground it releases a package. What is ... of the package, relative to the ground, the instant the package is released by the helicopter?
Last Answer : ANSWER: 6 METERS/SECOND UP
Description : A boy is standing on an elevator which is traveling downward with a constant velocity of 30 meters per second. The boy throws a ball vertically upward with a velocity of 10 meters per second ... the ball, MAGNITUDE AND DIRECTION, relative to the elevator shaft the instant the boy releases the ball?
Last Answer : ANSWER: 20 METERS PER SECOND DOWN
Description : Anyone know of a desktop mac application that combines social networks and mail? Similar to the not-yet-released Mozilla Raindrop or Windows only Inbox2?
Last Answer : Try Flock (http://flock.com/). Although it’s not mainly an e-mail app, it can check if you have new mail and display a notification.
Description : How long does it take a raindrop to reach the ocean?
Last Answer : answer:The Amazon River is approx. 6400 km long and it flows at a rate of 2.6 km/hr. I’d say a little over 3 months, if my calculations are right.
Description : Rain is falling vertically with a speed of 35 m/s. Wind starts blowing at a speed of 12 m/s in east to west direction. In which direction should a boy
Last Answer : Rain is falling vertically with a speed of 35 m/s. Wind starts blowing at a speed of 12 m/s ... should a boy waiting at a bus stop hold his umbrella?
Description : A ball falling vertically from rest for 3 seconds travels very nearly: w) 14.7 meters x) 29.4 meters y) 44.1 meters z) 88.2 meters
Last Answer : ANSWER: Y -- 44.1 METERS
Description : For a sphere falling in the constant drag co-efficient regime, its terminal velocity depends on its diameter (D) as (A) d (B) √d (C) d 2 (D) 1/d
Last Answer : (C) d
Description : A bullet is fired vertically upwards with a velocity of 2200 ft/s. Bullet ascends to a height of a.56,900 ft b.107 dynes c.75,000 ft d.48.300 ft e.65,800 ft
Last Answer : c. 75,000 ft
Description : A stone of wight 100 kg is thrown vertically upwards by a man of height y = 1.8 m with an initial velocity of 20 m/sec. The maximum height to which it will rise would be a.22.2 m b.26 m c.15.1 m d.20.2 m e.10 m
Last Answer : a. 22.2 m
Description : A ball weighing 250 gm is thrown vertically upwards with a velocity of 980 cm/sec. The time that the ball will take to return back to earth would be a.1 sec b.4 sec c.2 sec d.5 sec e.3 sec
Last Answer : c. 2 sec
Description : A stone is thrown vertically upwards from the ground with a velocity 15 m/s. At the same instant a ball is dropped from a point directly
Last Answer : A stone is thrown vertically upwards from the ground with a velocity 15 m/s. At the same instant a ball ... Use g = 10 m/s2 for ease of calculation).
Description : Two stones of unequal masses are thrown vertically up with the same velocity. Which of the following will happen? (1) The heavier mass will reach greater height (2) The lighter mass will reach greater height (3) Both will reach the same height (4) Any of them may reach greater height
Last Answer : (3) Both will reach the same height Explanation: Galileo's experiment showed that if two bodies of unequal masses are dropped from the same height, the time required by them to reach the ground are equal ... reach the ground is equal to unity. This means that both of them will reach the same height.
Description : An object is projected vertically upward near the surface of the earth. At the very top of its path, the object's velocity is zero, and its acceleration is: w) 0 x) 9.8 meters per second squared DOWNWARD y) 9.8 meters per second squared UPWARD z) depends on the mass of the object
Last Answer : ANSWER: X -- 9.8 METERS PER SECOND SQUARED DOWNWARD
Description : A boy throws a ball vertically upward with a velocity of 6 meters per second. How long does it take the ball to return to the boy's hand?
Last Answer : ANSWER: 1.22 SECONDS (accept: 1.2 seconds)
Last Answer : Both will reach the same height
Description : Rain drops falling through atmospheric air attain limited terminal velocity, because of (A) Upward thrust due to air (B) Viscous force exerted by air (C) Surface tension effects of water (D) Force of gravity
Last Answer : Option B
Description : A roller coaster reaches a velocity of 20 m/s at a location where the radius of curvature is 40 m. Calculate the acceleration in m/s2? a.10 b.9 c.11 d.8 e.107 dynes
Last Answer : a. 10
Description : Bob throws a rock striaght up at a velocity of 88 ft./s. What is the maxium height that the rock reaches?
Last Answer : See here on how to calculate this > http://www.ehow.com/how_8115675_calculate-height-velocity.html
Description : If a car starting from rest reaches a velocity of 18 m s-1 after 6.0 s then its acceleration is A. 1 m s-2 B. 2 m s-2 C. 3 m s-2 D. 4 m s-2
Last Answer : 3 m s-2
Description : Boundary layer separation occurs when the (A) Pressure reaches a minimum (B) Cross-section of the channel is reduced (C) Valve is closed in a pipeline (D) Velocity of sound is reached
Last Answer : (B) Cross-section of the channel is reduced
Description : A thin, flat & square plate measuring 2 m 2 m is freely hanging in ambient air at 25°C. It is exposed to the solar radiation falling on one side of the plate at the rate of 500 W/m2. The plate temperature will ... heat transfer co-efficient is __________ W/m2 °C. (A) 50 (B) 100 (C) 150 (D) 200
Last Answer : (B) 100
Description : A lead-acid battery is considered fully charged when the ______________. A. electrolyte gasses freely B. battery charger ammeter indicates a positive reading C. terminal voltage reaches a constant value at a ... cells reaches the correct value and no longer increases over a period of 1 to 4 hours
Last Answer : Answer: D
Description : A block P released from the top of a smooth inclined plane slides down the plane. Another block Q is dropped from the same point and falls vertically downwards. Which one of the following statements will be ... with the same speed (d) Block Q will reach the ground with a higher speed than block P
Last Answer : Ans:(c)
Description : Why is the initial velocity zero in the case of a falling object ?
Last Answer : Because the falling object starts falling from a fixed position. So its forward velocity is taken to be zero.
Description : In Newton's law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass varies as the __________ of its diameter. (A) Inverse (B) Square root (C) Second power (D) First power
Last Answer : (B) Square root
Description : In the Newton's law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass is __________ the fluid viscosity. (A) Directly proportional to (B) Inversely proportional to (C) Inversely proportional to the square root of (D) Independent of
Last Answer : (B) Inversely proportional to
Description : The terminal velocity of a solid spherical particle falling through a stationary fluid mass in the Stoke's law range is proportional to the (A) Inverse of fluid viscosity (B) Square of particle size (C) Difference in the densities of the particle & fluid (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : A particle is settling in a liquid under Stokesian conditions. The free falling velocity of the particle is proportional to (A) √(Particle diameter) (B) Particle diameter (C) (Particle diameter)2 (D) (Particle diameter)3
Last Answer : B) Particle diameter
Description : The kinetic energy of a stone falling near the earth's surface through a vacuum increases with the: w) square root of its velocity x) cube root of its velocity y) square of its velocity z) cube of its velocity
Last Answer : ANSWER: Y -- SQUARE OF ITS VELOCITY
Description : A boy sitting in a rail road car throws a ball straight up into the air. The ball will fall back into his hands when the rail road car is a.moving at constant velocity b.accelerating ... inclined plane, while another identical block B is released for free fall from the same height e.decelerating
Last Answer : a. moving at constant velocity
Description : If a boy sitting in a train, which is moving at a constant velocity, throws a ball straight up into the air, the ball will – (1) Fall in front of him (2) Fall behind him (3) Fall into his hand (4) None of the above
Last Answer : (3) Fall into his hand Explanation: If a person throws a ball vertically upwards in a moving train, it comes hack to his hand. The moment the ball was thrown, the ball was also in motion alone with ... ball move ahead by the same distance. This makes the ball to come back to his hand on its return.
Description : Drying of a wet solid under constant drying conditions means the exposure of the wet solid to the air of constant (A) Humidity (B) Velocity (C) Temperature (D) All (A), (B) & (C)
Last Answer : (D) All (A), (B) & (C)
Description : Thevelocityfactor of a transmissionline a. depends on the dielectric constant of the material used b. increases the velocity along the transmission line c. is govern by the skin effect d. is higher for a solid dielectric than for air
Last Answer : a. depends on the dielectric constant of the material used
Description : After a projectile is fired horizontally near the earth's surface, the horizontal component of its velocity, neglecting any air resistance: w) increases steadily x) decreases steadily y) first decreases, then increases z) remains constant
Last Answer : ANSWER: Z -- REMAINS CONSTANT
Description : If a boy sitting in a train, which is moving at a constant velocity, throws a ball straight up into the air, the ball will (1) fall in front of him (2) fall behind him (3) fall into his hand (4) None of the above
Last Answer : fall into his hand
Description : When the total product rises at an increasing rate, the - (1) marginal product is zero (2) marginal product is rising (3) marginal product is falling (4) marginal product remains constant
Last Answer : (2) marginal product is rising Explanation: Marginal product of an input (factor of production) is the extra output that can be produced by using one more unit of the input (for instance ... from total product. The other is average product. Marginal product is directly proportional to total product.
Description : Pick out the correct statement. (A) Bound moisture is removed during constant rate drying period (B) Free moisture is removed during falling rate drying period (C) The sum of free moisture and ... (D) The driving force for mass transfer in a wet solid is its free moisture content
Last Answer : (D) The driving force for mass transfer in a wet solid is its free moisture content
Description : The critical moisture content in case of drying indicates the __________ rate period. (A) Beginning of falling (B) Beginning of constant (C) End of falling (D) None of these
Last Answer : (A) Beginning of falling
Description : Which of the following methods is best suited for determination of permeability of coarse-grained soils? (A) Constant head method (B) Falling head method (C) Both the above (D) None of the above
Last Answer : Answer: Option A
Description : Which of the following methods is more suitable for the determination of permeability of clayey soil? (A) Constant head method (B) Falling head method (C) Horizontal permeability test (D) None of the above
Last Answer : Answer: Option B
Description : For the Stoke's law to be valid in the case of a falling sphere in a fluid, the (A) Reynolds number (based on sphere diameter) should be < 1 (B) Flow around the sphere should be in turbulent region (C) Sphere must be metallic (D) Fluid density should be constant
Last Answer : (C) Sphere must be metallic
Description : Marginal cost can be equal to Average variable cost when (a) Average variable cost is falling ; (b) Average variable cost is increasing; (c) Average variable cost is constant ; (d) Under any of the above situations
Last Answer : (c) Average variable cost is constant ;