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Object A has an emissivity of 0.95; and it temperature is 25 degrees C At what temperature (in degrees C) does object B, whose emissivity is 0.50, emit radiation at the same rate as object A if both objects have the same surface area?
Suppose an astronomical telescope is being designed to have an angular magnification of 31.6. If the focal length of the objective lens being used is 84.5 cm, Find the distance between the two lenses for a relaxed eye
Suppose that the Earth's orbit around the Sun is perfectly circular. Employing conservation arguments, find the value of the eccentricity e of the orbit
A four-turn circular wire coil of radius 0.495 m lies in a plane perpendicular to a uniform magnetic field of magnitude 0.415 T. what is the average induced emf in the wire during this time
To save fuel, some truck drivers try to maintain a constant speed when possible. A truck traveling at 116.0 km/hr approaches a car stopped at the red light. When the truck is 177.4 meters from the car the light turns green and the car immediately beg..
Starting from rest, a 4.50-kg block slides 3.00 m down a rough 30.0° incline. Determine the work done by the friction force between block and incline
Consider a 3.0 ball and a 5.4 ball in free fall. what is the net force acting on each
A spring gun (k = 29 N/m) is used to shoot a 56 gram ball horizontally. Determine the speed of the ball when it hits the ground
Assume that the coefficient of friction between your hands is 0.5, that the normal force between your hands is 35 N, What is the rate at which heat is generated
The rocket's speed was measured to be1.07c. The rocket's rest length is 126 m. An observer flying by gauged the rocket to be 777 m long. A rocket flying with the Sunat 0.85c gauged the speed of the photons (particles of light) emitted with the Sun to..
if a quasar is 100 times more luminous than a bright galaxy absolute magnitude about -21 what is the absolute magnitude
A stone with a mass of 0.700 is attached to one end of a string 0.8 long. The string will break if its tension exceeds 65.0 . The stone is whirled in a horizontal circle on a frictionless tabletop; the other end of the string remains fixed.
On average, an electric water heater operates for 1.2 h each day. It has a power requirement of 4500 W, What is the resistance of a typical water heater
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