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A soccer player kicks a ball from ground level with an initial velocity of 25 m/s at an angle of 30° above the horizontal. In all calculations, treat gravitational acceleration as g = 10 m/s2. After how many seconds does the ball reach its highest point?
Two 32.4-cm metal rods, one made of copper and one made of aluminum, are placed end to end, touching each other. How far does the other end of the system of rods move
An unmarked police car travelling a constant 80 km/h is passed by the speeder travelling 100 km/h. precisely l.0s after the speeder passes, the policeman steps on an accelerator; if the police car's acceleration is 2.0m/s2, how much time passes befor..
question1a student who weighs 490 n is wearing a backpack that weighs 88 n. the student is standing still on level
A softball of mass 0.220 kg that is moving with a speed of 5.5 m/s (in the positive direction) collides head-on and elastically with another ball initially at rest. calcultae the velocity of the target ball after the collision
A small wooden block with mass 0.875kg is suspended from the lower end of a light cord that is 1.80m long. What was the initial speed v0 of the bullet
A rectangular block of ice 12 m on each side and 1.3 m thick floats in sea water. The density of the sea water is 1025-kg/m3. The density of ice is 917 kg/m3. How many penguins of mass 26 kg each can stand on the ice block before they get their fe..
What is the wavelength of the second laser that would place its second maximum at the same location as the fourth minimum of the first laser, if = 0.300 ?
A metal bar is used to conduct heat. When the temperature at one end is 100 C and at the other is 20 C, what will be the rate of heat transfer
A 68 kg person sits on a 4.0 kg chair. Each leg of the chair makes contact with the floor in a circle that is 1.2 cm in diameter . Find the pressure exerted on the floor by each leg of the chair, assume the weight is evenly distributed.
A boat with a horizontal tow rope pulls a water skier. She skis off to the side, so the rope makes an angle of 15.0 degrees with the forward direction of motion. how much work does the rope do on the skier
q. a 30 gram mass is hanging from a spring whose unstretched length is 20 cm and whose spring constant is 2.5 nm. in
A lens that has a focal length of 8.45 cm is used as a magnifying glass. (Take the near point of a normal eye to be 25 cm from the eye.) What is the angular magnification
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