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A wooden raft has a mass of 55 kg. When empty it floats in water (density 100 kg/m^3 with 64% of its volume submerged. What mass of sand can be put on the raft without it sinking?
The bolts on a car wheel require tightening to the torque of 90 N•m. If a 30 cm long wrench is used, what is the magnitude of the force necessary when the force applied at 53° to the wrench.
A copy-cat daredevil tries to reenact Evel Knievel's 1974 attempt to jump the Snake River Canyon in a rocket-powered motorcycle. What is the minimum launch speed required for the daredevil
a 1.0 kg object is moving with a constant velocity 2.0 m/s toward the north. what is the second force that acts on the object
A 131kg astronaut (including space suit) acquires a speed of 2.32m/s by pushing off with her legs from an 1760kg space capsule. What is the change in speed of the space capsule
Water flows at 5.0;{rm L}/{rm s} through a horizontal pipe that narrows smoothly from 10 cm diameter to 5.0 cm diameter. A pressure gauge in the narrow section reads 50 kPa. What does the other pressure gauge read.
An AC voltage source, with a peak output of 120V, results in dissipation of energy in a resistor at rate of 100W. What is the value of the resistance
A 1.5-m-long glass tube, closed at one end,is weighed and lowered to the bottom of a fresh-water lake. Determine the depth of the lake
A golf ball of mass 0.045 kg is hit off the tee at a speed of 33m/s. Find the average force exerted on the ball by the golf club
Calculate charges, current, potential difference.
A hospital needs 1 millicurie of a radioactive pharmaceutical with a half-life of 12 hours. If delivery time takes 3 days, what activity must be shipped to the hospital by the supplier
A slide projector needs to create a 86 cm high image of a 2.0 cm tall slide, What focal length does the lens need and How far should you place the lens from the slide
A rms AC voltage of 118 V at 60 Hz is applied to an RLC circuit with 11.8 mH inductor, 0.171 µF capacitor, and 43.1 ? resistor in series. What is the power consumed in the circuit
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