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1. Does a tile floor feel colder than the area rug covering it?
2. Describe why it is better to wear mittens than gloves on a cold day.
3. Why is it better to wear several layers of clothing than one coat of equal weight?
4. Why do animals that have hollow, air-filled tubes for hair have an advantage in cold climates?
5. New windows typically have double or even triple panes of glass with a gas (argon or krypton) trapped among the panes and coatings that reflect infrared (IR) and ultraviolet (UV) light. In terms of heat transfer, why are these windows more “energy efficient” than single pane windows?
Decide the drift velocity of electrons in a 5-m long gold wire that carries a current of I = 10 A, if the wire is at a temperature of 87oC and if the total resistance of the wire is R =0.04 Ω.
A red car and a blue car are both travelimg east, with the red car 250 m behind the blue car. how far will the blue car travle before the red car cathes up and passes it
A pair of narrow, parallel slits separated with 0.270 mm is illuminated by the green component from a mercury vapor lamp (λ = 546.1 nm). The interference pattern is observed on a screen 1.23 m from the plane of the parallel slits.
You are on a train traveling east at speed of 28.0 m/s with respect to the ground. what is your velocity with respect to your friend
ten megawatts of electricty is to be transmitted over a power line of resistance 4 ohms. At what current will the power be transmitted
The x, y, and z components of a magnetic field are Bx = 0.14 T, By = 0.17 T, and Bz = 0.17 T. What is the magnitude of the magnetic force that acts on this wire
A high-speed photograph of a club hitting a golf ball, find the average force exerted on the ball by the club
Consider water flowing down a mountain. It moves purely as of gravity. Now consider that water has a layer of oil on top of it. How is the oil going to change the speed of water flowing down the mountain?
A coil of 1800 turns has an induced voltage of 150 volt. Calculate the rate of flux change in Wb/s
A satellite is in a circular orbit around an unknown planet. The satellite has a speed of 1.50 x 104 m/s, and the radius of the orbit is 5.15 x 106 meter. Find the orbital speed of the second satellite
A 2kg ball is rolling East (without slipping) down a hill that makes an angle of 30° with the horizontal. find the net acceleration at the instant the ball is kicked
Two radio antennas A and B radiate in phase. Antenna B is 160 m to the right of antenna A. Think about point Q along the extension of the line connecting the antennas, a horizontal distance of 55 m to the right of antenna B.
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