A 2.5-kg object falls vertically downward in a viscous medium at a constant speed of 2.5 m/s. How much work is done by the force the viscous medium exerts on the object as it falls 80 cm?
A. +2.0 J
B. +20 J
C. ?2.0 J
D. ?20 J
E. +40 J
Answer: D
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Young's Modulus: An aluminum wire 2.0 m long and 2.0 mm in diameter supports a 10.0-kg fixture. What is the stress in the wire? Young's modulus for aluminum is 7.0 × 1010 N/m2.
A. 3.1 × 107 N/m2 B. 6.2 × 107 N/m2 C. 9.3 × 107 N/m2 D. 1.2 × 108 N/m2
The moment reaction at A in the plane frame below is approximately:
(A) +1400 N?m
(B) 22280 N?m
(C) 23600 N?m
(D) +6400 N?m
A satellite is moved from a low orbit to one that is twice as far from Earth. The force of gravity is ________.
A. decreased by a factor of 2 B. unchanged C. decreased by a factor of 4 D. increased by a factor of 2 E. There is no gravity in space.
A 40.0-g block of ice at -15.00°C is dropped into a calorimeter (of negligible heat capacity) containing water at 15.00°C. When equilibrium is reached, the final temperature is 8.00°C
How much water did the calorimeter contain initially? The specific heat of ice is 2090 J/kg ? K, that of water is 4186 J/kg ? K, and the latent heat of fusion of water is 33.5 × 104 J/kg. A) 302 g B) 345 g C) 405 g D) 546 g E) 634 g