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A boat takes 3.2 hours to travel 28.01 km down a river, then 5.5hours to return. How fast is the river flowing?
A prism is made from a certain type of glass, and has a cross section shaped like an equilateral triangle. The indices of refraction for the red and violet light in this type of glass are 1.646 and 1.680, respectively. The angle of incidence for both..
A 6.6-kg rock and a 4.7 × 10-4-kg pebble are held near the surface of the earth. Determine the magnitude of the gravitational force exerted on each by the earth
An electron that has a horizontal initial speed of 4.50 106 m/s enters a region that has anelectric field of 120 V/m pointingvertically upward. How long does the electron take to travel19 cm in the horizontal direction?
A particle is projected from the surface of Earth with a speed equal to 3.4 times the escape speed. When it is very far from Earth
A heavy ball with a weight of 100N (m= 10.2 kg) is hung from the ceiling of a lecture hall on a 4.5-m-long rope. What is the tension in the rope at that point
A 0.15-kg of aluminum contains 0.2 kg of water. Initially, the water and the cup have a com- mon temperature of 18 0C, find the specific heat capacity of the unknown material
An automobile emits 20 lbs of CO2 per gallon of gasoline burned. how many billions of lbs of CO2 are emitted every year
A hoodlum throws a stone vertically downward with an initial speed of 12.0 m/s from the roof of a building,23.0 m above the ground. What is the speed of the stone at impact?
At the beginning of a dive, a diver is in the layout position with an angular velocity of 100°/s and a moment of inertia of 15 kg·m2. What is the diver's moment of inertia in the tuck position
A charged capacitor is connected to a resistor and switch as in the figure below. The circuit has a time constant of 1.60 s. Soon after the switch is closed, the charge on the capacitor is 90.0% of its initial charge.
satellite with an orbital period of exactly 24.0 h is always positioned over the same spot on earth. this is known as a
Westerly winds coming off the Pacific Ocean rise over the Rocky Mountains, which rise to a height of approximately 15,000 feet (580 hPa). The air on the western side of the mountain range is at 800 hPa (T = 70F, r = 0.75), and will subside on the ..
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