According to the universal law of gravitation, if you triple the distance between two objects, then the gravitational force between them
A) decreases by a factor of 9.
B) increases by a factor of 9.
C) decreases by a factor of 3.
D) increases by a factor of 3.
A) decreases by a factor of 9.
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Elastic Collisions: In a perfectly elastic collision, a 400-g ball moving toward the east at 3.7 m/s suddenly collides head-on with a 200 g ball sitting at rest.(a) Determine the velocity of the first ball just after the collision.(b) Determine the velocity of the second ball just after the collision.(c) Is kinetic energy conserved in this collision? How do you know?
What will be an ideal response?
In a nova, there is a white dwarf, an evolving companion star, and a(n) ________ surrounding the white dwarf's equator
Fill in the blank(s) with correct word
A container is filled with a mixture of helium (light molecules) and oxygen (heavy molecules) gases. A thermometer in the reads 22°C. Which gas molecules have the greater average speed?
A) It is the same for both of the gases because the temperatures are the same. B) The oxygen molecules do because they are diatomic. C) The oxygen molecules do because they are more massive. D) The helium molecules do because they are less massive. E) The helium molecules do because they are monatomic.
Water pressurized to 4 × 10^5 Pa is flowing at 5.0 m/s in a pipe which contracts to 1/3 of its former area. What are the pressure and speed of the water after the contraction? (density of water = 1 × 10^3 kg/m3)
a. 2 × 10^5 Pa, 15 m/s c. 3 × 10^5 Pa, 15 m/s b. 3 × 10^5 Pa, 10 m/s d. 4 × 10^5 Pa, 1.5 m/s