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A 65 kg man in a 5.9 kg chair tilts back so that all his weight is balanced on two legs of the chair. Assume that each leg makes contact with the floor over a circular area of radius 0.9 cm. Find the pressure exerted on the floor by each leg. The acceleration of gravity is 9.8 m/s2 .
The fastest that anyone has gotten to the top of a local mountain (elevation change of 3500 ft) is 44 minutes. Assume a weight of 160 lb for the bike and rider. What was the average power output used for this ride?
A satellite is in orbit 4.2*10^7 m from the center of Earth with a speed of 7,800 m/s. what is the mass of the satellite
A light bulb is wired in series with a 133-? resistor, and they are connected across a 120-V source. What are the two possible resistances of the light bulb
A copper wire is 6.00 m long and has a cross-sectional area of 2.00 10^-4 m2. what is the maximum torque that can act on it
You have been visiting a distant planet. Your measurements have determined that the planet's mass is two times that of earth but the free-fall acceleration at the surface is only one-fourth as large. What is the planet's radius
A He-Ne laser beam with an intensity of 1.00 x 103 W/m2 is incident from air to water, Find the intensity of the beam transmitted into the water
A 6-g bullet is fired into a 1.2-kg pendulum of length 83 cm. The pendulum swings by 12 degrees. What was the initial speed of the bullet? Please explain!!
We are not normally aware of the gravitational or electric force between two ordinary objects. What is the reason in each case? Give an example where we are aware of each one and why.
Three charges, each of magnitude 9 nC, are at separate corners of a square of edge length 4 cm. The two charges at opposite corners are positive, and the other charge is negative.
imagine that you spill a cup (250 g) hot water, initially at 75 C, onto the cold ground on a winter fay, Calculate the net change in the entropy of the universe due to this process, and comment on the result
question a glass rod rubbed with silk acquires a charge of 1.0times10-9 c.1-what is the charge on the silk?2-how many
If 70% of a radioactive sample has decayed in 5.0 x 103 years, what is the decay constant of the material
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