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Tom and Huck fashion a river raft out of logs. The raft is 3 m x 4 m x 0.15 m and is made from trees that have an average density of 700 kg/m3. How many people can stand on the raft and keep their feet dry, assuming an average person has a mass of 70 kg?
To protect their young in the nest, peregrine falcons will fly into birds of prey (such as ravens) at high speed. What was the raven's speed right after the collision
q1. an elevator cab in the new york marriott marquis has a mass of 4.43 x 103 kg and can carry a maximum load of 1.80 x
A 1,500kg satellite is placed in an orbit 8,000km above the surface of the Earth. a. What is the gravitational acceleration of the Earth at that altitude? b. What is the speed of the satellite? c. How long does it take the satellite to go around the ..
The critical angle for total internal reflection at a liquid-air interface is 45.0^\circ. what angle does the refracted ray in the air make with the normal
three identical electrically charged balls each of mass 2 kg are suspended from a common point with strings of the same
The photoelectric effect experiment is often carried out by using a mercury light source to illuminate a particular surface. What is the work function of this surface
A boy kicks a soccer ball to the right. A graph of Force on the y axis and time on the x axis shows the force on the ball reaches 100N from time 0 - .1 s, What is its final speed of the ball before it hits the ground
A hydrogen atom initially in the ground state absorbs a photon, which excites it to the = 4.00 state, estimate the frequency of the photon
A disk of radius 25 cm lies in a vertical plane and rotates with a constant angular acceleration of 5.00 rad/sec^2. What is the corresponding tangential speed
a block of mass m 3.0 kg is attached to a spring of constant k 240 nm. it can slide along a board tilted at an angle
Two identical boxcars (m = 15730 kg) are traveling along the same track but in opposite directions. what will be the final speed of the pair
A rod of mass 0.720 kg and radius 6.00 cm rests on two parallel rails (see figure below) that are d = 12.0 cm apart and L = 45.0 cm long. what is the speed of the rod as it leaves the rails
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