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A 820 kg- sports car collides into the rear end of a 2700 kg- SUV stopped at a red light. The bumpers lock, the brakes are locked, and the two cars skid forward 2.5m before stopping. The police officer, estimating the coefficient of kinetic friction between tires and road to be 0.80, calculates the speed of the sports car at impact. What was that speed.
A cannon ball is fired from ground level with a speed of 60.0 m/s at an angle of 58 deg. above the horizontal. what is the speed of the cannon ball when it is directly above the wall
White light is incident on a soap film (n = 1.29) in air. compute the minimum thickness of the soap film
A block of inertia .2 kg is launched from a spring onto a frictionless surface. The velocity it has upon leaving the spring is 2.5 m/s. What is the impulse delivered to the block by the wall
A technician wearing a circular metal band on his wrist moves his hand (from a region where the magnetic field is zero) into a uniform magnetic field of magnitude 2.0 T in a time of 0.30 s. find the magnitude of the average emf induced in the band
At t = 0, a 14.0 V battery is connected to a 1200 ? resistor in series with a 6.30 ?H inductor. What is the current after one time constant
A disk rotates about a fixed axis with an initial angular velocity of 20 rad/s. During a 5.0-s interval the angular velocity decreases to 10 rad/s. How many radians does the disk turn through during the 5.0-s interval
In a simple atom, the electrons making transitions between outermost energy levels and the innermost energy levels give rise to photons with the reddest colours.
A good baseball pitcher can throw a baseball toward home plate at 91 miles per hour with a spin of 1789 revolutions per minute. How many revolutions does baseball make on its way to home plate? For simplicity, assume that the 60.0 ft path is a straig..
A solar cell generates a potential difference of 0.320 V when a 445.0 ? resistor is connected across it and a potential difference of 0.504 V, find the internal resistance of the cell in Ohms
A nurse measures the temperature of a patient to be 39.3°C. What is this temperature on the Fahrenheit scale
A person fishing from a pier observes that five wave crests pass by in 7.4 s and estimates the distance between two successive crests to be 4.3 m. The timing starts with the first crest and ends with the fifth. What is the speed of the wave? m/s
if mars orbital period is (time for one orbit around the sun) is 1.886 earth years, what is the average speed of mars around the sun
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