1). A cart is moving horizontally along a straight line with constant speed of 30m/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 80m. At what speed (relative to the cart ) and at what angle(to the horizontal) must the projectile be fired?
a) 27m/s at 35 degrees
b) 24m/s at 44 degrees
c) 35.8m/s at 24 degrees
d) 38.6m/s at 54 degrees
2) An object is thrown upward from the egde of a tall building with a velocity of 10m/s. where will the object be 3sec after it is thrown? Take g = 10m/s^2
3) Two forces act on a point objectas follows: 100N at 170 deg and 100N at 50 deg. Find the resultant force.
a) 110N at 100 deg
b) 100N at 110 deg
c) 110N at 50 deg
d) 100N at 50 deg
4) A body hangs from a spring balance supported from the roof of an elevator. if the elevator has an upward acceleration of 3m/s^2 and the balance reads 50N, what is the true weight of the body?
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Expert's answer
2017-05-19T21:08:59-0400
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