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(a) A man weighing 720 N lies on a bed of nails. Find the average pressure exerted by a nail on his skin if there are 1210 nails and the flattened point on each nail has a radius of 0.500 mm.
(b) Calculate the pressure exerted on the skin by an acupuncture needle of radius 0.100 mm applied with a force of 5.20 N.
A student has built a 20-cm-long pinhole camera for a science fair project. She wants to photograph the Washington Monument, How far should she stand from the Washington Monument
A 150 g Copper bowl contains 220 g of water, at an initial temperature T1. A 300 g Copper cylinder at 7000 C is dropped into the water, How much energy is transferred to the bowl
Calculate the energy needed to accelerate a spaceship with a mass m = 25 × 103 kg toa speed of 0.40c. Compare this number with the approximate annual energy usage ofEarth, 1021 J
Determine the angular momentum of the Earth about its rotation axis (assume the Earth is a uniform sphere)
A car traveling at a constant speed of 21.5 m/s passes a trooper hidden behind a billboard. One second after the speeding car passes the billboard, the trooper sets off in chase with a constant acceleration of 3.10 m/s2. How long does it take the ..
Giancoli, page 30 --when they say that x-xo increases with the square of the initial speed. Why do they say square of initial speed only, what about square of final speed? And why do they ignore that the distance also decreases by a factor of 2.
A car travels at a constant speed around a circular track whose radius is 2.02 km. What is the magnitude of the centripetal acceleration of the car
A bat flying in a cave emits a sound and receives its echo 0.37s later. How far away is the cave wall? (Hint: The sound has to travel to the wall and then back again. Use 340 m/s for the speed of sound.)
The charge experiences a magnetic force of 7.41 10-3 N. A second charge q2 = 4.00 µC travels at an angle of 40.0° with respect to the same magnetic field and experiences a 1.80 10-3-N force. Identify the magnitude of the magnetic field and the ..
Establish angles subtended by the moon and the sun
From street level, Superman spots Lois Lane in trouble-the evil villain, Lex Luthor, Determine how long Superman takes to reach her
A person pushes the shopping cart with a force of 100 N acting down at 45 degrees. Of the cart travelled at a constant speed of 1.00 meters per second what is the value of combined retarding force acting horizontally on the cart due to friction an..
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