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A 0.954-kg toy car is powered by four AA batteries (6.00 V total) connected directly to a small DC motor. The car has an effective energy conversion efficiency of 30.6%, meaning that 30.6% of the electric energy applied to the motor is converted into translational kinetic energy. After 7.15 seconds, the car, which is initially at rest, reaches a speed of 1.81 m/s. What is the average current supplied to the car's motor?
Two identical launchers fire projectiles with the same initial velocity. One launcher is 3.54m above the ground and fires horizontally. what is the intial velocity of the projectiles
A high-tension power line composed of aluminum wire with cross-section area 24 x10?6 m2 carries a current of 1100 A. What is the power loss over 50 km of wire
A bicycle racer is traveling at 10 m/s with an acceleration of 0.5 m/s^2. The radius of the bicycle wheel is 33 cm. What is the angular velocity of the bicycle wheels
A uniform thin spherical shell has a raduis of 2.9 m and mass of 460kg and its center is located at the origin of a coordinate system. find the gravitional force of attraction between the two shells
If a material increases its length from 130 m to 132.60 m when its temperature is rasied 155 degrees C, what is its coefficient of linear expansion
When you take a bath, how many kg of hot water (49 oC) must you mix with cold water (13 C) so that the temperature of the bath is 36 oC? The total mass of the water (hot and cold) is 191-kg.
question1a small immersion heater can be used to heat a cup of water for coffee or tea. if the heater can heat 180ml
A partly full paint can has 0.42 U.S. gallons of paint left in it. how thick is the layer of wet paint
A 1 041-kg satellite orbits the Earth at a constant altitude of 103-km. What is the change in the system's potential energy
One mole of an ideal gas is heated so that T = AP2, where A is a constant and P is the pressure. The temperature changes from T0 to 4T0. Find out the work completed by the gas. (Use the following as necessary: T0, P0, and V0.)
Two 1.5cm -diameter disks face each other, 2.0mm apar, What launch speed must the proton have to just barely reach the positive disk
The speed of an ion in a particle accelerator is doubled from 0.430c to 0.860c. determine the final relativistic momentum of the ion
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