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A child looks at a reflective Christmas tree ball ornament that has a diameter of 9.0cm and sees an image of her face that is half the real size. How far is the child's face from the ball?
Two loudspeakers emit 400Hz notes. One speaker sits on the ground. The other speaker is in the back of a pickup truck, What is the truck's speed in m/s
the two stars in a binary star system have masses 1.7 x 10 ^ 30 kg and 5.8 x 10 ^ 30kg. They are separated by 2.1 x 10 ^ 12m, What is the speed of the heaviest star
A man ties one end of a strong rope 7.64 m long to the bumper of his truck, 0.505 m from the ground, and the other end to a vertical tree trunk at a height of 3.90 m. Compute the magnitude of the torque on the tree
A man driving a car toward a large vertical wall sounds his horn. The car is traveling at 92 km/h. What is the frequency of the car horn
Your motorboat can move at 30km/h in still water. How much time would it take you to move 12km upstream, in a river flowing at 6km/h.
What is torque exerted by the fish about an axis
A projectile proton with a speed of v collides elastically with a target proton initially at rest. what is the speed of the projectile proton
A charge of 2.05mC is placed at each corner of a square 0.160m on a side. Determine the magnitude of the force on each charge
A toy cannon uses a spring to project a 5.24 g soft rubber ball. The spring is originally compressed by 4.96 cm and has a force steady of 8.03 N/m.
A converging lens (f1 = 24.0 cm) is located 56.0 cm to the left of a diverging lens (f2 = -28.0 cm). How far is the object from the converging lens
A space station, in the form of a wheel 133 m in diameter, rotates to provide an "artificial gravity" of 2.20 m/s2 for persons who walk around on the inner wall of the outer rim. Find the rate of the wheel's rotation in revolutions per minute that wi..
A crate with mass 32.0 kg initially at rest on a warehouse floor is acted on by a net horizontal force of 156N. What acceleration is produced
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