The Earth remains in orbit about the Sun, rather than falling in to the Sun, because
1.it is outside of the gravitational influence of the Sun.
2.the net force on the Earth is zero.
3.although the Earth is constantly being pulled toward the Sun, it is always moving with a velocity component perpendicular to the direction that it is being pulled.
4.none of these apply.
3
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If a Ping-Pong ball and a golf ball both move in the same direction with the same amount of kinetic energy, the speed of the Ping-Pong ball must be
A) less than the golf ball. B) more than the golf ball. C) both the same D) need more information
Estimate the number of times an average person's heart beats in a lifetime. Assume the average heart rate is 69 beats/min and a life span of 75 years
A) 3 × 109 beats B) 3 × 108 beats C) 3 × 1010 beats D) 3 × 107 beats
A transformer has an input of 6 V and an output of 42 V. If the input is changed to 12 V, the output would be
A) 12 V. B) 48 V. C) 84 V. D) more than 84 V. E) none of the above
A sea breeze on a coast is the result of
a. Rayleigh scattering. b. a convection cycle. c. the Coriolis force. d. friction or drag.