The trajectory of a projectile is
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A cart is moving horizontally along a straight line with constant speed of 30 m/s. A projectile is fired from the moving cart in such a way that it will return to the cart after the cart has moved 80 m. At what speed (relative to the cart) and at what angle (to the horizontal) must the projectile be fired?
A. 35.8 m/s at 24 degrees
B. 38.6 m/s at 54 degrees
C. 27 m/s at 35 degrees
D. 24 m/s at 44 degrees
Answer: A
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What is common to the variation in the range and the height of a projectile?
A. horizontal velocity
B. time of flight vertical velocity, horizontal acceleration
C. vertical velocity
D. horizontal acceleration
Answer: B
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A stone thrown from ground level returns to the same level 4 s after. With what speed was the stone thrown? Take $g = 10ms^{-2}$
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An object is thrown upward from the edge of a tall building with a velocity of 10 m/s. Where will the object be 3 s after it is thrown? Take $g = 10ms^{-2}$
A. 15 m above the top of the building
B. 30 m below the top of the building
C. 15 m below the top of the building
D. 30 m above the building
Answer: C
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A body hangs from a spring balance supported from the roof of an elavator. If the elavator has an upward acceleration of $3ms^{-2}$ and the balance reads 50 N, what is the true weight of the body?
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Which of the following contributes to the instability of an object?
A. low centre of gravity
B. broad base of the object
C. low potential energy
D. high centre of gravity
Answer: A
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A rope suspended from a ceiling supports an object of weight W at its opposite end. Another rope tied to the first at the middle is pulled horizontally with a force of 30N. The junction P of the ropes is in equilibrium. Calculate the weight W and the tension T in the upper part of the first rope
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Which of the following does NOT refer to the terms description of stability of on an object?
A. unstable equilibrium
B. stable equilibrium
C. neutral equilibrium
D. central equilibrium
Answer: D
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Which of the following physical concepts best explains why passengers in fast moving cars should always fasten their seat-belts?
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