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A child is sliding down a snow-covered, approximately frictionless slope that makes an angle of 30? to the horizontal. At the bottom of the slope, she continues to slide for a while on rougher flat ground, which results in an acceleration opposite her direction of motion. She finally comes to a stop 5 m away from the bottom of the hill. 2
(a) If it takes her 2 s to slide down the hill (starting from rest), how far from the bottom (measured along the slope) did she start?
(b) How fast is she going when she reaches the bottom of the slope?
(c) What is her acceleration as she slides to a stop on the flat ground at the bottom of the slope?
An m = 6.60-kg clay ball is thrown directly against a perpendicular brick wall at a velocity of 22.0 m/s and shatters into three pieces, which all fly backward, as shown in the figure. The wall exerts a force on the ball of 2630 N for 0.110 s.
At an accident scene on a level road, investigators measure a car's skid mark to be 70 meter long. find the speed of the car when the driver slammed on (and locked) the brakes
A red laser pointer with a wavelength of 635 nm is shined on a double slit producing a diffraction pattern on a screen that is 1.75 m behind the double slit. The central maximum of the diffraction pattern has a width of 4.30 cm, and the fourth bri..
Miranda, a satellite of Uranus, is shown in part a of the figure below. It can be modeled as a sphere of radius 242 km and mass 6.68 1019 kg. What is his vector impact velocity
Some people will pay a higher price for brand-name goods. For example, some people buy Rolls-Royces and Rolex watches to impress others. Does knowingly paying higher prices for certain items just to be a "snob" violate the law of demand?
a horizontal circular platform rotates counterclockwise about its axis at the rate of 0.863 rads. you with a mass of
An initially uncharged air-filled capacitor is connected to a 4.01-V charging source, Find the capacitor's potential difference and charge after the insertion
a catcher catches a 145 g baseball traveling horizontally at 36.0 m/s. How large an impulse does the ball give to the catcher, what average force did the ball exert on the catcher
How does the amount of water displaced depend upon the mass of the ice? Most ice has some air bubbles in it. What effect does this have on the mass of the ice
The speedometer of a truck shows the linear velocity of the truck but actually measures the angular velocity of the wheels and converts that to the linear velocity. If the tires are changed out and larger diameter tires replace the stock tires, does ..
1 a 85cm3 block of iron is removed from an 800oc furnace and immediately dropped into 200 ml of 20oc water. what
A 15.0-m length of hose is wound around a reel, which is originally at rest. The moment of inertia of the reel is 0.440kg· m2, and its radius is 0.160 m. When turning, friction at the axle exerts a torque of magnitude 3.40 N· mon the reel.
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