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A 700-g block is released from rest at an initial height, above a vertical spring with constant k=400N/m and negligible mass. The block sticks to the spring and momentarily stops after compressing the spring 19.0 cm. How much work is done by the block on the spring and what is the value of the initial height?
An "energy bar" contains 21g of carbohydrates. If the energy bar was his only fuel, how far could a 68 kg person walk at 5km/hr? Express your answer using two significant figures.
A light stick with two masses attached to it is spinning about its center at 5 revolutions per minute. The length of the stick is 2.5 meters and the masses are 1.5 kg each.
A laser beam of unknown wavelength shines through the two slits and produces a diffraction pattern with dark bands at y1 = 8.9mm, what is the wavelength of the laser light used
A parallel plate capacitor has square plates with sides of length 10 cm. The distance between the plates is 4 mm. What is the amount of charge on each plate
A grocery cart with mass of 12kg is being pusch at constant speed up a flt 15 degree ramp by force which act at an angle 17 degree below the horizontal line.
A 10,000 kg railroad car is rolling at 2 m/s when a 4000 kg load of gravel is suddenly dumped in, What is the railroad car's speed
A 328 kg rocket moving radially outward from Earth has a speed of 7.28 km/s when its engine shuts off 173 km above Earth's surface. What maximum height (in km) above the surface is reached by the rocket
A uniform ladder 15 ft long is leaning against a frictionless wall at an angle of 56° above the horizontal. The weight of the ladder is 35 pounds. A 77 lb boy climbs 6.0 ft up the ladder. What is the magnitude of the friction force exerted on the lad..
A heat pump with a coefficient of performance of 4.9 absorbs heat from the atmosphere at a rate of 30kW. At what rate is it doing work
A rectangular fish tank measures 20 cm by 70 cm by 40 cm high. The tank is filled with water to a depth of 37 cm. What is the total force of the water on the bottom
In the Bohr-model hydrogen atom the single electron orbits the nucleus in a circle of radius a= 5.3*10 (-11) making f= 6.6*10( 15) revolutions each second
Calculate the cutoff frequency of the dominant mode and determine how many modes are passed at three times cutoff frequency of dominant mode and calculate the cutoff frequency of the dominant mode
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