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Light from a star has an intensity of about 57×10-8W/m2. If the star emits radiation with the same power as our Sun, how far away is it from Earth?
An important feature of the Carnot cycle is that: A) its efficiency can be 100% B) its efficiency depends on the absolute temperature of the hot reservoir used.
Pulsed lasers used in science and medicine produce very short bursts of electromagnetic energy. how many wavelengths are found within the laser pulse
Two lightweight rods 24 {rm cm} in length are mounted perpendicular to an axle and at 180 ^circ to each other. At the end of each rod is a 480 {rm g} mass. The rods are spaced 42 {rm cm} apart along an axle. The axle rotates at 4.90 rad/s.
a 1cm-tall object is 6cm in front of a converging lens with a focal length of 10cm. Use ray tracting to determine the location of the image on graph, Calculate the image position and height using the lens equation
0.0023 J of energy are stored in a parallel-plate capacitor whose plates each have area 0.30 m2, find the electric field energy density between the plates
Three forces act on a moving object. One force has a magnitude of 82.8 N and is directed due north. What must be the direction of the third force
An air puck of mass m1 = 0.30 kg is tied to a string and allowed to revolve in a circle of radius R = 1.0 m on a frictionless horizontal table. The other end of the string passes by a hole in the center of the table, and a mass m2 = 1.20 kg is att..
A force F applied to an object of mass m1 produces the acceleration of 3.10 m/s2. The same force applied to a second object of mass m2 produces an acceleration of 1.90 m/s2.
An arrow is launched vertically upward from a crossbow at 97.9 m/s. Ignoring air friction, what is its instantaneous speed at the end of 10.0 s of flight? What is its average speed up to that moment? How high has it risen? What is its instantaneou..
If a 2.00{rm kg} mass is now attached to the end of the spring, where will the end of the spring line up with the ruler marks?
A 1.25 Kohm and a 8.10 Kohm resistor are connected in parallel, what is the maximum voltage that can be applied across the whole network
A 1.0mm -diameter, 40cm -long copper wire carries a 3.5A current, What is the potential difference between the ends of the wire
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