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A sparrow's maximum air speed (speed relative to the air around it) is 20 m/sec. She wants to fly to her nest which is due north, but there is 10 m/sec wind blowing from west to east. What direction should she fly?
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Question: Situation: two electrons, each with mass m and charge q, are released from positions very far from each other. With respect to a certain reference frame, electron A has initial nonzero speed v toward electron B ...
Question: A certain brand of freezer is advertised to use 880 kW*h of energy per year. A) Assuming the freezer operates for 6 hours each day, how much power does it require while operating? B) If the freezer keeps its in ...
Quesiton: A rock is tossed straight up with a velocity of 20m/s When it returns, it falls into a hole 10 m deep. What is the rock's velocity as it hits the bottom of thehole? How long is the rock in the air, from the ins ...
Question: A point charge q1 = +2.40 μC is held stationary at the origin. A second point charge q2 = -4.30 μC moves from point a (x = 0.150 m, y =0) to point b (x = 0.250 m, y = 0.250 m). What is the electric potential ...
Question: A person is diving in a lake in the depth of h = 7.5 m. The density of the water is ? = 1.0 x103 kg/m3. The pressure of the atmosphere is P0 = 1.0 x 105 Pa. The surface area of the top of the person's head is A ...
A catapult launches a test rocket vertically upward from a well, giving the rocket an initial speed of 80.0 m/s at ground level. The engines then fire, and the rocket accelerates upward at 5.00 m/s^2 until it reaches an ...
Three people are fighting over a book. The mass of the book is m=9.18kg. Each person exerts a force on the book, F. The angle between the first person and the second person's force is 125.9 degrees. If the first person i ...
Question: Part A: How much time does it take light to travel from the moon to the earth, a distance of 384000 km ? Express your answer in seconds to three significant figures. Part B: Light from the star Sirius takes 8.6 ...
Question: A point charge of magnitude q is at the center of a cube with sides of length L. a) What is the electric flux through each of the six faces of the cube? b) What would be the flux through a face of the cube if i ...
Question: A submarine is stranded on the bottom of the ocean with its hatch 27.0 m below the surface. Calculate the force (in N) needed to open the hatch from the inside, given it is circular and 0.500 m in diameter. Air ...
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