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You notice you are running low on gas in your 1200kg car, and you are hoping you have enough gas to reach the bottom of the hill. You decide to harness your graitational potential energy combined with your initial kinetic energy at the top of the hill to help you get to the bottom of the hill without over working your engine, so you take your foot off of the gas pedal to coast down the hill. If your initial speed is 10 m/s, the elevation of the hill is 50 m and the work done by friction of the tires on the road is 150,000 J, what will your speed be at the bottom of the hill? Use conservation of energy.
A kicker's extended leg is swung for 0.4 seconds in a counterclockwise direction while accelerating at 200 deg/s2. What is the angular velocity of the leg
A styrofoam box used to keep drinks cold at picnic has total wall area(including the lid) of 0.80m2 and wall thickness 2 cm. it is filled with ice, water and cans at 0 Celsius. What is the rate of heat flow into the box if temperature of the outsi..
A box is at rest on a horizontal table. Is it because of the first law, second law, and or third law of motion that those two forces are equal
A charge of q = +7.50 µC is located in an electric field. The x and y components of the electric field are Ex = 4.80 103 N/C and Ey = 7.40 103 N/C, respectively. (a) What is the magnitude of the force on the charge? (b) Determine the angle that th..
Estimate the wavelength of the light.
how long one electron to travel the full length of the cable.
Illustrate what is the angular velocity of the merry-go-round now? What if the people were on it initially and then jumped off in a radial direction (relative to the merry-go-round)?
A particular banana contains 385 mg of potassium, of which a small fraction is the radioactive isotope _19^40 text (K) (see Appendix B). Approximation the activity of this banana because of _19^40 text (K).
A laser beam is incident on two slits with a separation of 0.210 mm, and a screen is placed 5.30 m from the slits. what is the wavelength of the laser light
A pinhole camera takes a picture of a building 200 m tall. If the height of the image on the back of the camera is 5 cm tall, how far is the camera from the building
The mass of the Sikorksky UH-60A helicopter is 9300kg. It takes off vertically at t=0. How fast is the helicopter rising 3 seconds after it takes off
A camper is trying to start a fire by focusing sunlight onto a piece of paper. The diameter of the sun is 1.39 × 109 m, What is the area of the sun's image on the paper
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