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?
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.
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?
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.
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)
a 90g bullet is fired from a rifle having a barrel 0.690m long. Assuming the origin is placed the bullet begins to move , the force (in newtons) exerted on the bullet bu the expanding gas is 1000 + 6000x- 35000x*x where x is in meteres a) determine the work done by the gas on the bullet as the bullet travels the length of the b ...continues
A sledge loaded with bricks has a total mass of 18.0 kg and is pulled at constant speed by a rope. The rope is inclined at 20.0° above the horizontal, and the sledge moves a distance of 20.0 m on a horizontal surface. The coefficient of kinetic friction between the sledge and surface is 0.550. (a) What is the tension in the ro ...continues
An ice cube weighs 30 grams at 0 degrees Celsius. It is added to 200 g of water at 80 degrees Celsius in an insulated container. What is the final temperature of the mixture? The affect of the container is negligible.
At 6 degrees Celsius a metal rod is 1.5 m total length with half the length steel and the other half brass. The rod is heated to 150 degrees Celsius. What is the total change in length?
A heat engine has an energy source of 500 degrees Celsius, and it has a cooling system at 90 degrees Celsius. What is the maximum efficiency possible of this engine? If the engine does 100 kJ of work what is the least amount of heat it must exhaust?
