You throw a rock horizontally off a cliff with a speed of 20 m/s. after two seconds, the magnitude of the velocity of the rock is closest to

how much force does the motor of an elevator need to exert to hold a 1000 kg elevator still if the counterweight weighs 7000 newtons?

Mark puts an object that has a mass of 58.2 kg in a cart that has a mass of 73.00 kg. How should Mark report the total mass to the correct number of significant figures? 131 kg, to have the same number of significant figures as 58.2 kg 131.

A 2.5 m - long wire carries a current of 8.0 A and is immersed within a uniform magnetic field B⃗. When this wire lies along the + x axis, a magnetic force F⃗ = (-2.3j) N acts on the wire, and when it lies on the + y axis, the force is F⃗ = (2.3i-5.

What is the difference between an energy source and an energy resource?

The mass of a newborn baby is 4.2 kilograms what is the baby's weight? (The acceleration due to gravity is 9.8 m/s2)

7. A type of non-renewable energy would be: O wind O petroleum O water solar

A refrigerator is a system. The energy input into the refrigerator system (in the form of electricity) is the same as the amount of energy output from the system. Which of the following best describes the energy output of the system?

A 1,120 kg car is travelling with a speed of 40 m/s. Find its energy.

3. Calculate the amount of current through a 45-watt light bulb that is connected to a 120-volt circuit in your home.

Are oranges called oranges because oranges are orange, or is orange called orange because oranges are orange?