A 4.0-kg particle is moving horizontally with a speed of 5.0 m/s when it strikes a vertical wall. The particle rebounds with a speed of 3.0 m/s. What is the magnitude of the impulse delivered to the particle?
a. 24 N/s
b. 32 N/s
c. 40 N/s
d. 30 N/s
e. 8.0 N/s
b
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The wire in Fig. 29-2 carries a current I that is decreasing with time at a constant rate. The induced emf in each of the loops is such that
A) no emf is induced in any loop. B) all loops experience counterclockwise emf. C) loop A has clockwise emf, loop B has no induced emf, and loop C has counterclockwise emf. D) loop A has counterclockwise emf, loop B has no induced emf, and loop C has clockwise emf. E) loop A has counterclockwise emf, loop B clockwise emf, and loop C has clockwise emf.
Most of the waves in the electromagnetic spectrum are
A) red light. B) blue light. C) green light. D) invisible.
When a car is braked to a stop, its kinetic energy is transformed into
a. stopping energy b. potential energy c. heat energy d. energy of motion
Supernovas are thought to always result in
A) neutron stars. B) red giant stars. C) regular stars like our Sun. D) white dwarfs. E) black dwarfs.