A block of metal weighs 40 N in air and 30 N in water. What is the buoyant force that the water exerts on the block? The density of water is 1000 kg/m3
A) 10 N
B) 30 N
C) 40 N
D) 70 N
A
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Free Fall: A hammer is thrown upward with a speed of 14 m/s on the surface of planet X where the acceleration due to gravity is 3.5 m/s2 and there is no atmosphere. What is the speed of the hammer after 8.0 s?
A. 7.0 m/s B. 14 m/s C. 21 m/s D. 64 m/s
Conservation of Momentum: Two ice skaters suddenly push off against one another starting from a stationary position. The 45-kg skater acquires a speed of 0.375 m/s relative to the ice. What speed does the 60-kg skater acquire relative to the ice?
A. 0.50 m/s B. 0.28 m/s C. 0.38 m/s D. 0.75 m/s E. 0.00 m/s
Dipole-induced dipole forces of attraction exist between water and gasoline, and yet these two substances do not mix because water has such a strong attraction for itself
Which of the following compounds might best help to make these two substances mix into a single liquid phase? A) the molecule on the far left because the O-H bond is polar and the carbon and hydrogen bonds are nonpolar B) the molecule in the middle because when the salts mix into the water, it will help separate the water and decrease the attraction for itself C) The molecule on the right will form attractions with the polar ends of the water, allowing the gasoline a chance to mix with the water. D) All of these molecules would be equally effective at increasing the mixing of gasoline and water.
A 3.50 kg block is pulled along a moving conveyor belt at a constant speed of 0.500 m/s relative to a stationary observer while the belt moves at a constant speed of 0.200 m/s in the same direction. If the coefficient of kinetic friction is 0.400, the magnitude of the mechanical energy dissipated, in J, caused by the force of friction on the block in 8.00 s is
a. 5.6. b. 22.0. c. 32.9. d. 54.8. e. 76.8.