A block of material of mass m and specific heat c falls from height h and reaches speed v just before striking the ground. Its temperature is measured immediately after it strikes the ground. If we ignore any change in temperature owing to interaction with the air, the change in temperature of the block of material is
A.
.B.
.C.
.D.
E.
Answer: E
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A horizontal 52-N force is needed to slide a 50kg box across a flat surface at a constant velocity of 3.5 m/s. What is the coefficient of kinetic friction between the box and the floor?
A) 0.11 B) 0.13 C) 0.10 D) 0.09
A 1 200-kg experimental rocket sled on level frictionless rails is loaded with 55.0 kg of propellant. It exhausts the propellant in a 20-s "burn." If the rocket, initially at rest, moves at 155 m/s after the burn, what impulse is experienced by the rocket sled?
a. 8.5E+3 kg/m/s b. 1.3E+5 kg/m/s c. 1.9E+5 kg/m/s d. 8.5E+5 kg/m/s e. 2.1E+5 kg/m/s
Terminal Voltage and Internal Resistance: You buy a AA battery in the store, and it is marked 1.5 V. If this marking is strictly accurate, while this battery is fresh
A. its terminal voltage will be more than 1.5 V when it is used in a circuit. B. its terminal voltage will be less than 1.5 V when it is used in a circuit. C. its terminal voltage will be 1.5 V when it is used in a circuit.
The quantum-mechanical process by which an alpha particle makes it through the potential barrier holding it in the nucleus is called
A. leaping. B. tunneling. C. transmitting. D. fissioning. E. transporting.