A mine railroad car, of mass 200 kg, rolls with negligible friction on a horizontal track with a speed of 10.0 m/s. A 70. kg stunt man drops straight down a distance of 4.0 m, and lands in the car
How fast will the car be moving after this happens?
7.41 m/s
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Briefly explain why spectral lines are useful in determining the chemical composition of their source
What will be an ideal response?
Newton's second law states: sum of forces = mass × acceleration. If a known force was applied to an object with a known mass, how would you predict that object's acceleration?
A) acceleration = mass × sum of forces B) acceleration = sum of forces / mass C) acceleration = mass / sum of forces D) Newton's second law is irrelevant for solving this problem.
The central core inside an atom is the neutron
a. True b. False Indicate whether the statement is true or false
A 10-kg block has twice the density of water. Compared to 10 kg of water, its volume is
1) as much, 2) half as much, 3) twice as much, and when suspended in water its mass will seem to be 4) 0 kg. 5) 3.33 kg. 6) 5 kg. 7) 10 kg. 8) none of these.