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As part of an exercise routine a 47.0 kg person climbs a set of stairs. Each stepis18.0 cm high and thereare 78 steps in the staircase.Assuming the work done coming down the staircase is negligible, howmany times must this person climb the staircase in order to workoff as much energy as a 2030 Calorie meal?
To stretch a certain spring by 2.20 from its equilibrium position requires 7.00 of work. What is the force constant of this spring
Peter and Carter are dropping rocks into a stream from a bridge at a height of 28 m above the water below, As Meg emerges from the water below she is struck by both rocks. Calculate the speed of each rock at impact with Meg
While looking at her image in a cosmetic mirror, Dina notes that her face is highly magnified when she is close to the mirror, but as she backs away from the mirror, her image first becomes blurry, then disappears when she is about 24.0 cm from th..
A 1500 kg car is approaching the intersection at 11 m/s. He is 40 m away from the intersection. Find the minimum acceleration needed for the car to come to rest
the moon has an angular size of .5degrees when viewed with unaided vision from earth. what is the angular size of the moon as seen through this telescope
A diffraction grating with 330 {rm lines/mm} is 1.00 {rm m} in front of a screen. What is the wavelength of light whose first-order maxima will be 17.0 {rm cm} from the central maximum on the screen.
The protein ?-lactalbumin (molecular weight = 14,000) has been studied under different solution conditions by dynamic light scattering. At pH 7 and 40°C in a dilute solution the diffusion coefficient was found to be 14.25×10-7 cm2/s.
A uniform board is leaning against a smooth vertical wall. The board is at an angle (theta) above the horizontal ground. Find the smallest value for the angle (theta), such that the lower end of the board does not slide along the ground.
Suppose a cube of aluminum which is 1.00 cm on a side accumulates a net charge of +3.10 pC. (a) What percentage of the electrons originally in the cube was removed.
Sam (75 kg) takes off up a 50 m high, 10 degree frictionless slope on his jet powered skis. how far does Sam land from the base of the cliff
A solenoid that has a length equal to 24.6 cm, a radius equal to 0.842 cm, Find the magnetic flux through the solenoid
A Carnot engine takes in heat from a reservoir at 470°C and releases heat to the lower-temperature reservoir at 200°C. What is its efficiency.
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