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A large boulder is ejected vertically upward from a volcano with an initial speed of 40.2 m/s. Air resistance may be ignored.
1. At what time after being ejected is the boulder moving at a speed 19.0 upward?
2. At what time is it moving at a speed 19.0m/sdownward?
3. When is the displacement of the boulder from its initial position zero?
4. When is the velocity of the boulder zero?
5. What is the magnitude of the acceleration while the boulder is moving?
6. What is the direction of the acceleration while the boulder is moving? Up or down?
A typical wind speed at midlatitudes at 700 hPa might be 40 knots, while synoptic scale vertical motion is 10 cm/s. what is the magnitude of the total flow
A transformer has 400 primary turns and 1510 secondary turns. The input voltage is 120 V and the output current is 16.0 A. Assume 100 percent efficiency. What is the output voltage
Acircular hole of radius 8.470×10−1 cm mustbe cut into the front panel of a displayunit. The tolerance is1.0×10−3 cm, which means the actual hole cannot differ by more than this quantity fromthe desired radius.
Light from the sun arrives at the earth, an average of 1.50×1011 m away, at the rate of 1.40×103 W/m2, for an area perpendicular to the direction of the light. What is the power output of the sun
Suppose the masses of stars are distributed according to f(M)dM == M^-2 dM. Assume you can use the luminostiy mass relation L == M^3. (Both a and b are constants.) What is teh corresponding distribution function for luminosities, g(L), such that g(L)..
The temperature of a body is increased from -173 C to 357 C. What is the ratio of energies emitted by the body per second in these two cases
0.20g of hydrogen gas are held in a rigid container. The temperature of the gas is changed from 50 K to 80 K. How much heat is needed.
Two ocean liners, each with a mass of 40,000 metric tons, are moving on parallel courses, 92 m apart. What is the magnitude of the acceleration of one of the liners toward the other due to their mutual gravitational attraction? Care for the ships as ..
As a result of the friction of tides, the earth rotates more slowly as time progresses. Each year the time it takes for the earth to complete one rotation increases by 20microseconds. at what rate [J/(yr*K)] is entropy being generated due to tidal ..
In one day, a 75 kg mountain climber ascends from the 1400 m level on a vertical cliff to the top at 2380 m. find her change in gravitational potential energy on the second day
a converging lens has a focal length of f 26 cm. an object is placed 37 cm from the lens. find the size of the image
The owner of a van installs a rear-window lens that has a focal length of -0.299 m. When the owner looks out through the lens at a person standing directly behind the van, How tall is the person
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