A heavy truck and a small car rolling down a hill at the same speed are forced to stop in the same amount of time. Compared with the force that stops the car, the force needed to stop the truck is
A) greater.
B) smaller.
C) the same.
Answer: A
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What is the wavelength of a neutron having a kinetic energy of 0.025 eV? (The mass of a neutron is 1.67 × 10-27 kg.)
A) 3.7 × 10-22 m B) 2200 m C) 1100 m D) 1.8 × 10-10 m E) 3.2 × 10-20 m
A juggler throws two balls up to the same height so that they pass each other halfway up when A is rising and B is descending. Ignore air resistance and buoyant forces. Which statement is true of the two balls at that point?
A. There is an residual upward force from the hand on each ball. B. There is a greater residual force from the hand on A than there is on B. C. Only gravity acts on B but there is an additional residual force from the hand on A. D. There is an additional downwards force besides gravity on each ball. E. The only force acting on each ball is the gravitational force.
Standing Sound Waves: An organ pipe that is 1.75 m long and open at both ends produces sound of frequency 303 Hz when resonating in its second overtone. What is the speed of sound in the room?
Fill in the blank(s) with the appropriate word(s).
Protostars shine brightest in
A. radio waves. B. visible spectrum. C. X-ray. D. infrared spectrum.