How do i do a Wavelength and frequency problem

a horizontal force of 100N is required to push a crate across a factory floor at a constant speed. What is the net force acting on the crate / What is the force of friction acting on the crate?

Which is an example of a wheel and axle

If 190 grams of water is cooled from 42.7°C to 21.2° C how much energy was lost by the water?

A 1000-watt microwave oven takes 90 seconds to heat a bowl of soup. How many joules if energy does it use?

What is the latent heat of gasoline?

Radio waves can be sent directly through the earth.

You carry a 7.0 kg bag of groceries 1.2 m above the ground at constant velocity across a 6.8 m room. How much work do you do on the bag in the process? A) 396J B) 466J C) 0.0J D) 82J

The atomic mass of potassium is 39. if its atomic number is 9, it has how many neutrons within each potassium atom?

17. Suppose you were standing on a scale in an elevator in free fall. What would the scale read? 18. Explain why the feeling weightlessness in free fall is not the same as truly being weightless. 19.

The momentum of an isolated system is conserved A) only in inelastic collisions. B) only in elastic collisions. C) in both elastic and inelastic collisions