Does an object need a force to start moving

In a two planet system, what happens to the period when velocity is maximized? a. It increases. c. It decreases. b. It remains constant. d. No period can be calculated because the planet can escape the Sun's gravitational pull at high velocities.

What phenomenon causes colors of visible light to be separated by a prism?

Suppose that 0.95 g of water condenses on a 75.0 g block of iron that is initially at 22 °c. if the heat released during condensation is used only to warm the iron block, what is the final temperature (in °c) of the iron block?

You are holding a positive charge and there are positive charges of equal magnitude 1 m to your north and 1 m to your east. What is the direction of the force on the charge you are holding? 1. to the east 2. to the southwest 3. to the south 4.

Which of the following would likely be the best reflector of heat energy

For each of the following, describe the relationship as directly or inversely proportional: a) wavelength vs. frequency b) wavelength vs. energy c) frequency vs. energy ... ?

Can hand sanitizer be used as rubbing alcohol

Two objects experience a 12 N electrical force between them. What force will the objects experience if the distance between them is doubled?

a submarine moving directly upward in the water at constant speed. The weight of the summer and it is 500,000 N. The submarines motors are off. The magnitude of the buoyant force acting on the submarine is

If the car went 30 km west in 25 min. and then 40 km east in 35 min., what would be its total displacement?