On a balanced seesaw, a boy three times as heavy as his partner sits
A) less than 1/3 the distance from the fulcrum.
B) 1/3 the distance from the fulcrum.
C) more than 1/3 the distance from the fulcrum.
Answer: B
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A 5.00-g bullet is fired into a 950-g block of wood suspended as a ballistic pendulum. The combined mass swings up to a height of 8.00 cm. What was the kinetic energy of the bullet immediately before the collision?
a. 1.4E+2 J b. 1.5E+3 kJ c. 3.9E–3 J d. 1.4E+8 J e. 1.5E+2 J
Which of the following is a unit of power?
a. kilowatt-hour b. newton c. joules per second d. foot-pound e. none of these
In a region of space where the magnetic field of the earth has a magnitude of 80 mT and is directed 30° below the horizontal, a 50-cm length of wire oriented horizontally along an east-west direction is moved horizontally to the south with a speed of 20 m/s. What is the magnitude of the induced potential difference between the ends of this wire?
a. 0.45 mV b. 0.35 mV c. 0.30 mV d. 0.40 mV e. 0.69 mV
Which form of radiation is not suitable for determining the elastic strain in a crystalline material using diffraction?
(a) X-rays (b) Visible light (c) Electrons (d) Neutrons