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One cubic meter of water flowing over Niagara Falls in New York drops 96.6 meters. If all the energy of the water is converted to heat, how much heat energy would the water have?
A butterfly at eye level is 26 cm in front of a plane mirror. You are behind the butterfly, 48 cm from the mirror. What is the distance between your eye and the image of butterfly in the mirror.
assume that the microwave radiation has a wavelength of 11.2 cm. How many photons are required to heat 235 mL of coffee from 25.0 ^circ rm C to 62.0 ^circ rm C.
Two identical small insulating balls are suspended by separate 0.208m threads that are attached to a common point on the ceiling. Determine the charge on each ball
Three resistors with values 0.90? , 2.9? , and 4.2? are connected in parallel in a circuit with a 6.4V battery. What is the total equivalent resistance
A hydraulic lift is used to jack a 970 kg car 13 cm off the floor. The diameter of the output piston is 18 cm, and the input force is 250 N. Calculate the combined work input of all of the strokes
A 9 V battery is rated at 80 Ah. It can deliver a current of 80 A for one hour, or a current of 40 A for 2 hours, etc. What is the total energy stored in the battery
The mass then travels vertically and it takes 1.10 s for the mass to reach the top of its trajectory. Determine the spring constant, in N/m. (Use g=9.81 m/s2). Assume that the time required for the spring to reach its full extension is negligible.
At a height of ten meters above the surface of a freshwater lake, a sound pulse is generated. How deep is the lake
Travelling at a speed of 17.10 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.740. What is the speed of the automobile after 1.81 s have el..
An iron bolt of mass 70.0 g hangs from a string 35.2 cm long. The top end of the string is fixed. Find the magnetic force on the bolt
A 10-cm-diameter parallel-plate capacitor has a 1.0 mmspacing. What is the magnetic field strength on the axis
At one point in a pipeline, water's speed is 3.30 m/s and the gauge pressure is 4.00×10^4 Pa. Find out the gauge pressure at a second point in the line 13.0 m lower than the first if the pipe diameter at the second point is twice that at the first.
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