If the magnification of a mirror is negative, which of the following is correct?
A) The image is upright and the mirror is convex.
B) The image is inverted and the mirror is convex.
C) The image is inverted and the mirror is concave.
D) All of the previous answers can be correct.
E) None of the previous answers is correct.
C
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The pitch of a sound is determined by
A) the amplitude. B) the speed. C) the frequency. D) the wavelength. E) none of the above
A 1-kg ball is released from a height of 6 m, and a 2-kg ball is released from a height of 3 m. Air resistance is negligible as they fall
Which of the following statements about these balls are correct? (There could be more than one correct choice) A) As they reach the ground, the 1-kg ball will have more kinetic energy than the 2-kg ball because it was dropped from a greater height. B) As they reach the ground, the 1-kg ball will be moving faster than the 2-kg ball. C) Both balls will reach the ground with the same speed. D) Both balls will reach the ground with the same kinetic energy. E) Both balls will take the same time to reach the ground.
You are traveling quickly along a freeway. Your car has kinetic energy. You suddenly skid to a stop because of congestion in traffic. Where is the kinetic energy that your car once had?
1.All of it goes into internal energy in the road. 2.All of it goes into internal energy in the tires. 3.Some of it goes into internal energy of the road and some into internal energy of the tires. 4.Some of it goes into internal energy of the road, some to internal energy of the tires, some to other internal energy, and some is transferred away by mechanical waves.
An electron which moves with a speed of 7.5 × 10^3 m/s parallel to a uniform magnetic field of 0.40 T experiences a force of what magnitude? (e = 1.6 × 10^-19 C)
a. 1.9 × 10^-15 N c. 2.2 × 10^-24 N b. zero d. 4.8 × 10^-14 N