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A kg block is being pushed along a surface by a force of 70 N. The coefficient of kinetic friction between the block and the surface is mu = .2. Find the acceleration of the block.
Suppose that the sound level of a conversation is initially at an angry 74 dB and then drops to a soothing 50 dB. Assuming that the frequency of the sound is 516 Hz, determine the (a) initial and (b) final sound intensities (in ?W/m2) and the (c) ..
A 495-? resistor, an uncharged 1.50-µF capacitor, and a battery with an emf of 6.21 V are connected in series. What is the current after one time constant
A ball with a diameter of 10 cm is submerged in water. The buoyant force of the water on the ball is
A person is riding a bike, the wheels of a bike have an angular velocity of +18.5 rad/s. Evaluate the angular acceleration of each wheel
A track star in the broad jump goes into the jump at 12 m/s and launches her at 20 degrees with respect to the horizontal. How long is she in the air before returning to Earth
A water heater pumps water from the basement of a house to a faucet 8.9 meters above. The main water pipe is 5.1 cm in diameter. Calculate the speed of the water as it leaves the pump
determine the acceleration of the moon toward earth using values for its mean distance and orbit period from the
A tennis player swings her 1000 gram racket with a speed of 11.0 m/s. Find how fast is her racket moving immediately after the impact
A refracting telescope has an angular magnification of -92.00. The length of the barrel is 1.100 m. What are the focal lengths of the objective
Refrigerant-134a enters a compressor at 180 kPa as a saturated vapour with a flow rate of 0.35 m3/min and leaves at 700 kPa. The power supplied to the refrigerant during compression process is 2.35 kW. What is the temperature R-134a at the exit of th..
Such neutron sources are called RaBe sources, or PuBe sources if they use plutonium to get the α s. Calculate the energy output of the reaction in MeV.
Squaw Valley ski area in California claims that its lifts can move 48300 people per hour. estimate the maximum total power needed
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