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Determine how many times greater heat loss occurs through a glass window thats 80.0 cm high, 70 cm wide, and 0.300 cm thick (k = 0.791 W/m°C) than a electrical supply line running outside to an exterior mounted light. This 30.0 cm long supply line consisting of three copper wires, each 1.50 mm in diameter, that are well insulated and only exposed at the very ends of each wire. The thermal conductivity of copper is 395 W/m°C. Hint: Since this problem is a direct comparison, it really won't make any difference what you choose for inside and outside temperatures.
Assume, instead, that the observer had been moving away from Earth with a speed of 0.80c. How much time would observer have measured for the car to be filled in this case.
An airplane with a wing span of L = 27m flies horizontally at a location where the vertical component of the Earth's magnetic field is B = 6.0 x10 -5 T.
In what direction should the pilot travel in this direct flight. Find out the distance she walks.
A very long non conducting cylinder of diameter 10.0 cm carries charge distributed uniformly over its surface. Each meter of length carries +5.50 C of charge. A proton is released from rest just outside the surface.
A 1500 {rm kg} car skids to the halt on a wet road where mu_k = 0.50. How fast was the car travelling if it leaves 66-{rm m}-long skid marks.
find out the z-component of the block's momentum after the kick.
Take the gravitational constant to be = 6.67×10^-11 Nm^2/kg, the mass of the earth to be = 5.97×10^24 kg, and the radius of the Earth to be = 6.38×10^6 m.
What is the tangential acceleration of a bug on the rim of a 7 in. diameter disk if the disk moves from rest to an angular speed of 76 revolutions per minute in 4 s.
The linear impulse delivered by the hit of a boxer is 248 N • s during the 0.373 s of contact. What is the magnitude of the average force exerted on the glove by the other boxer? React in units of N
An artillery shell is fired with a minimal velocity of 470m/s at 50o above the horizontal. To clear an avalanche, it explodes on a mountain side 38 s after firing.
A bicycle wheel has a diameter of 64.1 cm and a mass of 1.81 kg. suppose that the wheel is a hoop with all of the mass concentrated on the outside radius. The bicycle is placed on a stationary stand and a resistive force of 120 N is applied tangent..
In addition, snow exerts a retarding force on the sled that points opposite to the direction of motion, and has a magnitude of 57 N. Find out the acceleration of the sled and child.
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