A 10 Newton effort force is required to lift a 10 kg box just off the ground. What is the effort required to lift the box off the ground using a 3m long lever? [The fulcrum is placed 0.5m from the box.]

Describe what causes day and night

Suppose you watch a leaf bobbing up and down as ripples pass it by in a pond. You notice that it does two full up and down bobs each second. Which statement is true of the ripples on the pond? They have a frequency of 2 hertz.

To receive certification or registration as a medical assistant you must

A cold block of metal is placed in contact with a warm block of metal. Which type of energy will be transferred between the blocks? thermal energy chemical energy electrical energy mechanical energy

The radius of a cone is increasing at a rate of 333 centimeters per second and the height of the cone is decreasing at a rate of 444 centimeters per second. At a certain instant, the radius is 888 centimeters and the height is 101010 centimeters.

A piano emits frequencies that range from a low of about 28 hertz to a high of about 4200 hz. find the range of wavelength in air attained by this instrument when the speed of sound in air in 342m / s

Which statement is true about a polarized object? A) It gains electrons and becomes negatively charged. B) It gains protons and becomes positively charged. C) The number of positive and negative charges can be the same. D) It has to be a metal.

Define the law of conservation of momentum in one sentence

A shopping cart rolls from x=19.9m to x=5.40m with an average velocity of - 0.418m/s. How much time did it take? (unit=s)

Where does the energy of a nuclear power plant come from?