a force of 20 N acted on a ball thereby imparting an impulse of 70 Ns to the ball. For how long did the force act on the ball?

How much tension is in a rope if it pulls a 5-kg bucket filled with water with an upward acceleration of 1m/s^2

A bird flies 2km to the south, then 0.2km to the north. What is the displacement of the bird? A. 0.2km south B. 2.2km C. 1.8km D. 1.8km south

Ocean basins form as a result of A. equatorial precession. B. weathering and erosion. C. the movement of tectonic plates. D. the movement of deep ocean currents.

Which of the following compounds will be most effective in melting the ice on the roads when the air temperature is below zero? A. sodium iodide (NaI) B. magnesium sulfate (MgSO4) C. potassium bromide (KBr) D. All will be equally effective.

If large amount of heat are transferred to a solid, what will probably happen to the state of the solid?

A glass window is a clear object that light passes through as it travels in a straight line. This is a good example of A. refraction of light. B. transmission of light. C. absorption of light. D. reflection of light.

Why is net force a vector sum A. All forces have direction and magnitude B. Forces can only be attractive C. All forces are contact forces D. There are four fundamental forces

Does the elf owl's small size allow it to live in cacti

If grapefruit juice has a ph of 3.0 and egg white have a ph of 8.0, which contains more h + ions? how many more?

Consider a single photon with a wavelength of λ, a frequency of ν, and an energy of e. What is the wavelength,? Consider a single photon with a wavelength of λ, a frequency of ν, and an energy of e.