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It is claimed that if a lead bullet goes fast enough, it can melt completely when it comes to a halt suddenly, and all its kinetic energy is converted into heat via friction. Find the minimum speed of a lead bullet (initial temperature = 39.0° C) for such an event to happen? (Use Lf = 2.32 104 J/kg and melting point = 327.3°C.)
The 3.10 kg, 34.0-cm-diameter disk is spinning at 350 rpm How much friction force should the brake apply to the rim to bring the disk to a halt in 2.20 s.
A 140 ? lamp, a 25 ? electric heater, and a 57 ? fan are connected in parallel across a 137 V line. What is the current of the lamp
A 4.40-g lead bullet at 32.0°C is fired at a speed of 230 m/s into a large block of ice at 0°C, What quantity of ice melts
When you walk toward a mirror you see your image approaching you. If you walk at 2 m/s, how fast do you and your image approach each other
A car rounds a circle of radius 180 m , going at 14.5 m/s. What's the car's acceleration if its speed is constant. Compute the new acceleration if the speed is increasing at a rate of 2.4 m/s^2
A string is attached to a rigid support and the cylinder allowed to drop from rest. Find out the acceleration of the cylinder.
Recent studies have raised concern about `heading' in youth soccer (i.e., hitting the ball with the head). A soccer player `heads' a size 4 ball deflecting it by 59.0°, What is the magnitude of the impulse which the player must impart to the ball
A star with the same mass and diameter as the sun rotates about a central axis with aperiod of about 28.4 days. What would be the new rotation period (s) of the star
According to the Guinness Book of World Records, the world record for spitting a watermelon seed is 68 feet, 9 and 1-eighth inches. What was the seed's launch speed
An inductor has a 57.0-? reactance when connected to a 60.0-Hz source. What is the maximum current in the inductor
A mass of 0.25 kg is attached to a horizontal spring with a spring constant of 4.0 N/m. Write an expression for the position of the mass as a function of time
The drill pipe has an outer diameter of 75 mm, a wall thickness of 6 mm, and a weight of 0.8 kN/m. If it is subjected to a torque and axial load as shown, determine the principal stresses and maximum in-plane shear stress
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