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A krypton laser produces a cylindrical red laser beam 2.0 mm in diameter with 2.0 W of power. What is the light intensity on a wall 2.4 m away from the laser?
The drawing shows two copper [? = 17 × 10-6 (C°)-1] rods of different lengths mounted on one side of an immovable wall. What change in the gap occurs when the rods are heated to 77 °C
A 100-g piece of metal initially at 100 C is placed in a 250 gof water contained in a 300-g aluminum vessel initially at 20.o C. what is the specific heat of the unknown piece of metal
A laser beam is incident on two slits with a separation of 0.230 mm, and a screen is placed 5.10 m from the slits. what is the wavelength of the laser light
After falling from rest from a height of 28 m, a 0.46 kg ball rebounds upward, reaching a height of 18 m. If the contact between ball and ground lasted 1.7 ms, illustrate what average force was exerted on the ball?
Find the velocity vector of a bag just before it hits the ground. It is dropped 500m above the ground and has velocity 5 m/s
A coil of wire has a resistance of 38.0 ? at 25° C and 43.7 ? at 51° C. What is the temperature coefficient of resistivity
a projectile is projected from the origin with a velocity of 45.0 m/s at an angle of 30.0 degrees above the horizontal. what is the range of the projectile
Mercury has a mass MP = 3.18 x 1023 kg, an orbital period T = 88.0 days, and an orbital radius r = 5.79 x 1010 m. Assume the orbit of Mercury around the Sun is approximately circular. Find the angular speed of Mercury about the Sun.
a child does 350 J of work while pulling a box from the ground up to his tree house with a rope the tree house is 8.4 m above the ground
Brian is trying to pull Julie on a sled across a flat snowy field. Brian puls on a rope attached to the sled. how much force must Brian exert on the rope to start moving the sled
A step-down transformer is used for recharging the batteries of portable electronic devices. Find the current on the secondary side
q1. before throwing a 1.49 kg discus an athlete rotates it along a circular path of radius 1.18 m. the maximum speed of
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