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Question1
A 5.0m diameter garden pond holds 1.59x10^3 of water. Solar energy is incident on pond at an average rate of 400 watts per meter squared. If water absorbs all the solar energy and does not exchange energy with its surroundings, how many hours will it take to warm from 15 degrees celsius to 25 degrees celsius?
Question2
A 0.01-kg object is initially sliding at 9.0 m/s. It goes up a ramp (increasing its elevation by 1.5 m), and next moves horizontally before striking a spring of force constant k = 100 N/m. The spring is compacted by 5.0 cm as it completely stops the object. How much heat energy was created throughout this motion?
How to find out potential energy
A person weighing 700N on a wire. find the tension force in the two segments of the wire. left wire 20 degrees and right wire 40 degrees.
A uniform solid sphere of mass 1.5 kg and diameter 30.0 cm starts from rest and rolls without slipping down a 35° incline that is 7.0 m long. Determine the angular speed of the sphere about its center at the bottom of the incline
Two point charges lie on the x-axis: 1.80uC at x=1.15m, Find the place(s) where the electric field is zero
Desperate for money, you take a scary job climbing a very tall 2.640 hm high tower to make a repair. How far away are they in feet from the tower bottom
The catapult on an aircraft carrier can take an aircraft from 0 to 85.6 m/s in 12.4 seconds, What is the acceleration of the aircraft when it launches
Would a plucked guitar sting vibrate for a longer time or a shorter time if the instrument had no sounding board? explain.
A pair of oppositely charged parallel plates are separated by a distance of 5 cm with a potential difference of 550 V between the plates. A proton is released from rest at the positive plate at the equal time that an electron is released from rest..
A) What are science misconceptions? What other names are used to refer to them? How are they formed? What difficulties do they present to the learning and understanding of science concepts?
A tennis player swings her 1000g racket with a speed of 12m/s . She hits a 60g tennis ball that was approaching her at a speed of 17m/s. what is the average force that the racket exerts on the ball
An electromagnetic wave in a vacuum has a magnetic field with a magnitude of 1.72 x 10^-6 T. What is the intensity S of the wave
Two isotopes of a certain element have binding energies that differ by 4.9060 MeV. Find the difference in atomic mass between the two isotopes
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