Physics Answers

what is the efficiency of a diesel engine that receive 214.1 J of energy from combustion and lose 185.3 J by heat to exhaust during one cycle?

a proton moving horizontally at 3.7 x 10 to the fifth power ms and thirst and a uniform magnetic field of 0.08 e60 directed upward at 35 degrees with the horizontal find the magnitude of the magnetic force acting on the proton

1. A concave mirror has a 7.0 cm focal length.  A 2.4 cm object is 16.0 cm from the mirror.  Determine the image height.

A scuba driver is in fresh water has a tank with a volume of 0.0100m^3. The air in the tank is initially at a pressure of 1.00×10^7 Pa. Assume that the driver breathes 0.500 L/s of air. Density of fresh water is 1.00×10^3 kg/m^3.

How long will it take the tank at depths of 2.70 m?

 A police investigator measures straight skid marks 27 m long in an accident investigation. Assuming a friction force is 8.00 x10^3 and a car mass is 1.00 x10^3 kg, what was the minimum speed of the car when the brakes locked?

 The resistance of a uniform copper wire 50.0 meters long and 1.15 mm in

diameter is 0.830 ohms at

20° C. What is the resistivity of the copper at this temperature?

Consider a mixture of 2 mol of helium and 4 mol of oxygen. Compute the speed of sound in this gas mixture at 300 K

angular velocity of the telescope as it orbits round the sun

Calculate the electric field strength from a 1.25x10-8C charge if the test

charge is placed 2.50x10-5m.

A flexible rectangular coil of wire with 150 loops is stretched in such a way that its dimension changes from 5 cm x 8 cm to 7 cm x 11 cm in 0.15 s in a magnetic field of 25T that is 30 degrees relative to the plane of the coil.

a. Calculate the induced EMF

b. How much energy in joules was dissipated in the circuit if the total resistance is 100Ω?

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Given:

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