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Question1
A small immersion heater can be used to heat a cup of water for coffee or tea. If the heater can heat 180mL from 27 C to 94C in 12 min, approximately how much current does it draw from the car's 12-V battery? Suppose 70 percent efficiency.
Question2
A rifle that shoots bullets at 460 m/s is to be aimed at a target 45.7 m away. If center of the target is level with the rifle, how high above the target have to the rifle barrel be pointed so that the bullet hits dead center?
One side of the roof of a building slopes up at 37.0°. A roofer kicks a round, flat rock that has been thrown onto the roof by a neighborhood child.
The solid shaft in is made from brass that has an allowable shear stress = 100 MPa and a shear modulus of elasticity G = 39 GPa. what is the required diameter of the shaft
In an emergency situation, a person with a broken forearm ties a strap from his hand to clip on his shoulder. find the tension in the strap
The motion of a 25.0 kg mass on the end of a string is uniform circular motion. The magnitude of the tangential velocity of the mass is 5.0 m/s, Calculate the angular momentum of the mass
A light stick with two masses attached to it is spinning about its center at 5 revolutions per minute. The length of the stick is 2.5 meters and the masses are 1.5 kg each.
determine the microwave frequency
Use Pascal's principle. Given that Fout is 68 lb., the areas of the output and input cylinders are Aout 21 in2 and Ain 6 in2, what is the input force
A jet of water squirts out horizontally from a hole near the bottom of the tank. If the hole has a diameter of 3.40 mm, what is the height, h, of the water level in the tank.
A small office building air conditioner operates on 250 V AC and consumes 3.88 kW, What is its effective resistance and How is energy related to power? Check units for consistency
The right and left end wires of two circuits are separated by a distance d = 2 mm. If L = 13 cm, V1 = 14 V, V2 = 17 V, R1 = 1 ?, what is the resistance (in ohms) of R2
A homeowner is trying to move a stubborn rock from his yard which has a mass of 1.150 × 103 kg. what is the minimum total length of board required to move the rock
A block of wood of mass 2 kg is suspended by long, light strings and is at rest. A bullet of mass 40 g, strikes and remains in the block, causing it to swing. The utmost height of the block above its rest position is 51 cm.
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