Question about Power consumption

The Electric Meter in a House indicates that the refrigirator consumes 70.0 kWh in a week. a. what is the power consumption of the refrigirator? b. assuming it is connected to a potential difference of 120V, How much current does the refrigirator draw?

Resistance and current

The heating element of an electric broiler dissipates 2.8 kW of power when connected to a potential difference of 120 V. a. what is the resistance of the element? b. How much current does the broiler draw? use two ways to find out, and verify your answer.

Simple Physics

A 615 kg car was involved in an accident. The accepted coefficient of friction between concrete and rubber is 0.65. The skid marks left by the car are 18.6m long. How was was the car moving when it hit the brakes?

More simple physics

a 0.025kg bullet traveling at 305m/s strikes a 1.500 kg ballistics pendulum hanging from a 2.00 m long string and buries itself in the block. How many degrees backward will the block swing? Do not use the law of conservation of momentum.

Yet more simple physics

Think about a rollercoaster. If it loaded at a height of about 500m and then dropped down to almost ground level and was follewed by 7 circles where the circles height was about the same it would not work well. Explain in terms of kinetic energy, potential energy, etc. why not. (Picture included if needed)