A projectile is fired from ground level at an angle of 40.0° above horizontal at a speed of 30.0 m/s. What is the speed of the projectile when it has reached a height equal to 0.500 of its maximum height?
A)
26.0
B)
27.4
C)
28.7
D)
26.7
E)
28.1
D
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If no external forces act on a moving object, it will
A) continue moving at the same speed. B) move slower and slower until it finally stops. C) come to an abrupt halt. D) none of the above
A ball with diameter 10. cm rolls without slipping on a horizontal table top. The moment of inertia of the ball is 2.2 × 10-3 kg- m2 and its translational speed is 0.45 m/s
(a) What is its angular speed about its center of mass? (b) What is its rotational kinetic energy? (c) What is its angular momentum?
A student slides her 80.0-kg desk across the level floor of her dormitory room a distance 4.00 m at constant speed. If the coefficient of kinetic friction between the desk and the floor is 0.400, how much work did she do?
A) 128 J B) 3.14 kJ C) 26.7 J D) 1.26 kJ E) 24.0 J
An object is placed 15.0 cm to the left of a double-convex lens of focal length 20.0 cm. The image of this object is located
A) 60.0 cm to the right of the lens. B) 60.0 cm to the left of the lens. C) 8.57 cm to the right of the lens. D) 8.57 cm to the left of the lens. E) 30.0 cm to the left of the lens.