1) You did 7,500 Joules of work by running up son

power did you exert?

of work by running up some stairs in 2.3 seconds. What Power did you exert?

The gap between electrodes in a spark plug is 0.060 cm. Producing an electric spark in a gasoline-air mixture requires an electric field of 3.0 * 106 V/m. What minimum potential difference must be supplied by the ignition circuit to start a car?

A beam of protons is accelerated through a potential difference of 0.725kV and then enters a uniform magnetic field traveling perpendicular to the field. A) What magnitude of field is needed to bend these protons in a circular arc of diameter 1.

Which of the following types of lithospheric crusts collide to produce large mountains such as the Himalayan mountains?

A wave has a speed of 30 m/s, a frequency of 6 Hz, and a wavelength of 5 m. If the wavelength remains constant, and the frequency is doubled, what is the new speed of the wave?

Two buses leave St. Louis from the same station. One leaves at 5:00 PM, traveling north to Chicago at an average speed of 50 mph. The second leaves at 5:30 PM, traveling south to New Orleans, also at an average speed of 50 mph.

A fan is to accelerate quiescent air to a velocity of 12.5 m/s at a rate of 9 m3/s. Determine the minimum power that must be supplied to the fan. Take the density of air to be 1.18 kg/m3.

In which situation will the lowest resistance occur?

a box has mass 60 kg and it is lying on the earth surface occupying an area of 6000 CM square then the pressure exerted by it on the ground is equal to

A 16.0 kg canoe moving to the left at 12.5 m/s makes an elastic head-on collision with a 14.0 kg raft moving to the right at 16.0 m/s. After the collision, the raft moves to the left at 14.4 m/s. Disregard any effects of the water.

How many significant figures does the number 91010.0 have?