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Question: A rock is projected from the edge of the top of a building with an initial velocity of 15 m/s at an angle of 45° above the horizontal. The rock strikes the ground a horizontal distance of 25 m from the base of the building. Assume that the ground is level and that the side of the building is vertical. How tall is the building?
A rifle with a weight of 30 N fires a 5.0-g bullet with a speed of 300 m/s. If a 700-N man holds the rifle firmly against his shoulder, find the recoil speed of the man and rifle
A 17.0-g piece of Styrofoam carries a net charge of -0.75 µC and is suspended in equilibrium above the center of a large, compute the charge per unit area on the plastic sheet
An electron is in a certain energy state in a one-dimensional, infinite potential well from x = 0 to x = L = 125 pm. What is the change in the electron's energy
The Mars Reconnaissance Orbiter circles the red planet with a 119 period. The mass of Mars is 6.42*10^23 , the radius is 3.38*10^6. What's the spacecraft's altitude?
Visible light passes through a diffraction grating that has 900 slits per centimeter, and the interference pattern is observed on a screen that is 2.56 m from the grating. In the first-order spectrum, maxima for two different wavelengths are separ..
A portable 3.5 kw wate heater is immersed for 3 minutes in a plastic filled with 20 kg of water at 20C. what will be the final temperature of the mixture given specific heat of water at 4186 j/gkC.
Consider a heavy particle of mass m is place at the top (on the outside side, not inside) of a vertical hoop of radius R and mass M. find the location of the hoop center X as a function of angle theta of the falling particle
Water ripples are produced by making a cork oscillate up and down at a frequency of 5 Hz. What is the PERIOD of the water ripples
after flying for 15 min in a wind blowing 42 kmh at an angle of 20o south of east an airplane pilot is over a town that
90 grams of water at 80°C are mixed with an equal amount of water at 20°C in a completely insulated container. The final temperature of the water is 50°C. How much heat is lost by the hot water
A toaster rated at 1040 Woperates on a 120 V household circuit and a 4.00 m length of nichrome wire as its heating element. calculate What is the cross-sectional area of the wire
the mass of a muon is 105.7 MeV/c^2. what is the value of the Rydberg constant for a muonic atom and what is the binding energy of a muonic atom
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