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Two stars have the same radius but have very different temperatures. The red star has a surface temperature of 2,600 K and the blue star has a surface temperature of 14,500 K. By what factor is the blue star more luminous compared to the red star? The blue star is ____ times more luminous.
The leader of a bicycle race is traveling with a constant velocity of +11.2 m/s and is 10.4 m ahead of the second-place cyclist. How much time elapses before he catches the leader
A 3.0-kg cylinder falls vertically from rest in a very tall, evacuated tube 20m above the surface of the earth. what is the cylinder's initial potential energy
When two unknown resistors are connected in series with a battery of fixed potential difference V, the battery delivers a power Ps When two unknown resistors are connected in parallel with the same battery,
The accompanying pressure-volume graph shows an engine cycle with one isothermal process, B-C. What is the net work done by the gas during one cycle
The fundamental frequency of a pipe that is open at both ends is 592 Hz. How long is this pipe?
A juvenile elephant has a mass of 300kg. He wishes to fly using his very large ears. find the total surface area of his two ears
A square loop of wire with sides of length 44cm is in a uniform magnetic field perpendicular to its area. What would be the average emf if the sides of the loop were only 22cm
Suppose you used a hot pot to convert a 150 g piece of ice that was initially at -15 C into liquid water at 50 C. how to find how long it will take to complete the process
An initially uncharged hollow metallic sphere with radius of 5 cm has a small object with a charge of +10 µC carefully placed at the center of the sphere through a hole in the latter's surface
A horizontal force of 5.0 N accelerates a 4.0 kg mass, from rest, What friction force acts on the mass
When at rest a proton experiences a net electromagnetic force of magnitude 9.4 x 10-13 N pointing in the positive x direction. When the proton moves with a speed of 1.3 x 106 m/s in the positive y direction the net electromagnetic force on it decr..
A hypodermic syringe contains a medicine with the density of water (see figure below). The barrel of the syringe has a cross-sectional area of 2.50 x 10^-5 m2. In the absence of a force on the plunger, the pressure everywhere is 1.00 atm.
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