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Q1. Two horizontal forces, 231N and 190N, are exerted in opposite directions on a crate. What is the net horizontal force on the create? Be sure to indicate the direction of the net force. (Assume that the 231 N forces are in the positive direction.)
Q2. A clean copper surface is exposed to light of wavelength 275 nm. What is the maximum speed of the photoelectrons emitted from this surface? Use the table below copper=4.7eV
Q3. A winter hiker's body generates heat at a rate up to a maximum value of 126 W. She is hiking on a brisk day in which the outdoor temperature is 9 °C, while wearing a jacket with goose down insulation. How thick should jacket be so that she can maintain a normal body temperature? Suppose her surface area for heat flow (the jacket) is 1.50 m2 and that all of her body heat flows out through the jacket. (Assume the thermal conductivity to be 0.025 W/m • K.)
A television set connected to a 121 V outlet consumes 88 W of power. How long does it take for 10 million electrons to pass through the television.
Calculate P necessary to just start opening the 2 m wide gate.
What is the mass of sculpture (in kg) assume that the local acceleration due to gravity is 9.80 m/s2.
An ocean liner leaves New York City and travels 56.0° north of east for 170 km. How far east and how far north has it gone? In other words, what are the magnitudes of the components of the ship's displacement vector in the following directions.
Why does the base of a shuttle cock always lead in motion when hit with a racket. what is grocery carts final speed.
You are driving home from school steadily at 80 for 150. It then begins to rain and you slow to 50. You arrive home after driving 3 hours and 20 minutes.
What is the value of g at the location of this satellite. Discover the altitude of the satellite in meters.
Compute the force of tension or compression
What is the horizontal component of the ball velocity
A 0.34 kg iron horseshoe that is initially at 616 ?C is dropped into a bucket containing 25 kg of water at 28 ?C. What is the final equilibrium temperature? Avoid any energy transfer to or from the surroundings and assume the specific heat of iron is..
What is magnitude of the net force on the student
A 60kg bicyclist rides his 7.8kg bicycle with a speed of 16m/s. How much work must be done by the brakes to bring the bike and rider to a stop.
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