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A student drops a rock into a water well. Exactly 2.472 seconds after she released the rock, she hears the sound of the splash caused by the rock hitting the water's surface. What is the depth of the water's surface from the top of the well? Assume that the speed of sound in the air to be 340 m/s.To be safe during a lightning storm, it is best to be (a) in the middle of grassy meadow. (b) inside a metal car. (c) next to a tall tree in a forest. (d) inside a wooden building. (e) on a metal observation tower. (Justify your answer)
What is the magnitude of the Electric force 55 × 10 uC charge exerts on a 8.5 × 10^3 C charge located 0.75 m away ?
Natalie, Sadie, and Maddie go tobogganing on one of those icy hills; which is so slippery it can be considered to be frictionless. It is real snow, not the fake stuff. They start from an initial speed of 2.3 m/s at the top of the hill. The toboggan has a mass of 3.0 kg and the three students have a combined mass of 250 kg. It is a sunny day and the snow has a temperature of -4℃!
suppose the body in sample problem number2 is projected at 24.5 m/s, 60 degree above the horizontal. Find the (a)time of flight, (b) range, and (c) maximum height
A capacitor consists of two square metal plates, each measuring 5.00x10^-2 m on a side. In between the plates is a sheet of mica measuring 1,00x10^-4 m thick. What is the capacitance of this capacitor
A football player kicks a field goal, launching the ball at an angle of 49∘ above the horizontal. During the kick, the ball is in contact with the player's foot for 0.049 s, and the ball's acceleration is 260 m/s^2. What is the range of the football?
Express your answer to two significant figures and include appropriate units.
What is the acceleration due to gravity at a distance from the center of the earth which is equal to diameter of the earth
A 6.5 kg bowling ball thrown with a speed of 5.4 m/s hits a stationary 1.75 kg pin. What is the velocity of each object? Assume that the coefficient of restitution of 0.75.
How many significant figures does the number 3,001×10^5 have?
