A model rocket of mass, m, is fired upward from a launch pad with some initial speed, v. A gravitational force is exerted on the rocket
1.at all points in its motion except at it highest point.
2.at all points in its motion.
3.at no points in its motion.
4.at none of these choices.
2
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Why are there fewer large craters on the seafloor than on the continents?
A) The seafloor crust is younger than the continental crust. B) The oceans slow large impactors and prevent them from making craters. C) The oceans erode away craters faster than erosion processes on land. D) Large impactors primarily strike land masses. E) Large impactors aim for life-forms such as dinosaurs.
An x-ray photon with wavelength 15.0 pm is scattered at 
by an electron. What is the wavelength of the scattered photon?
A. 31.0 pm B. 14.9 pm C. 1.57 pm D. 17.2 pm E. 12.8 pm
An M star is hotter than an O star
Indicate whether the statement is true or false
Three cars (car L, car M, and car N) are moving with the same velocity, and slam on the brakes. The most massive car is car L, and the least massive is car N
Assuming all three cars have identical tires, for which car is the amount of work done by friction in stopping it the highest? A) The amount of work done by friction is the same for all cars. B) Car L C) Car M D) Car N