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A radio tower has a 64-foot shadow cast by the sun. If the angle from the tip of the shadow to the top of the tower is 78.5 degrees, what is the height of the radio tower?
An 880 N box is pushed across a level floor for a distance of 5.0m with a force of 440N. How much work was done on the box
A parallel plate capacitor has a capacitance C when there is no dieletric inside of it. Suppose a wedge of material with dielectric constant K is inserted in between the plates of the capacitor, find the new capacitance with this dielectric inserte..
A 480HZ sound wave in 20 centigrade air propagates into the water of a swimming pool. Assume that the wave's speed in the water is 1480m/s. What is the wave's frequency in the water? What is the wave's wavelength in the water?
A +6.00-µC charge is moving with a speed of 8.80 104 m/s parallel to a very long, straight wire. Find the magnitude and direction of the force on the charge
A proton, which is the nucleus of a hydrogen atom, can be modeled as a sphere with a diameter of 2.4 fm, what is the density of the proton
You push your physics book 1.60 along a horizontal tabletop with a horizontal push of 2.80 while the opposing force of friction is 0.550. What is the net work done on the book
Starting from rest, two skaters "push off" against each other on smooth level ice, where friction is negligible. find the recoil velocity of the man relative to the ice
Three capacitors of 2.0, 9.0, and 15.0? F are joined together in parallel. What is their equivalent capacitance
Find the focal length of a glass lens that has an index of refraction equal to 1.58, a concave surface that has a radius of curvature of magnitude 104 cm, and a convex surface
A 1.00kg ball is at rest on the floor in a 2.10m * 2.10m * 2.10m room of air at STP. Air is 80% nitrogen (N2) and 20% oxygen (O2) by volume. What is the thermal energy of the air in the room
q1. if air drag is negligibly small how fast is sequoia cone moving while it reaches the ground if it dropped from the
A 15,000 kg F-18 (jet fighter) lands at 50 m/s on an aircraft carrier, its tail hook snags the cable to slow it down. The cable is attached to a spring with a spring constant of 62,000 N/m. How far does the spring stretch to stop the jet?
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