A racecar driver steps on the gas, changing his speed from 10 m/s to 30 m/s in 4 seconds. The acceleration of the racecar is _________
Fill in the blank(s) with correct word
5 m/s2
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Neutron stars are expected to spin rapidly because
a. they conserved angular momentum when they collapsed. b. they have high orbital velocities. c. they have high densities. d. they have high temperatures. e. the energy from the supernova explosion that formed them made them spin faster.
An emf is induced in a wire by moving the wire near a magnet
Indicate whether the statement is true or false
The figure shows the orientation of a flat circular loop consisting of 50 closely wrapped turns each carrying a current I. The magnetic field in the region is directed in the positive z direction and has a magnitude of 50 mT. The loop can turn about the y axis. If ? = 20°, R = 0.50 m, and I = 12A, what is the magnitude of the torque
exerted on the loop?
a.
8.1 N ? m
b.
24 N ? m
c.
22 N ? m
d.
13 N ? m
e.
16 N ? m
Sound travels as a transverse wave in air and other materials
Indicate whether the statement is true or false