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A 765-kg two-stage rocket is traveling at a speed of 6.80×103m/s away from Earth when a predesigned explosion separates the rocket into two sections of equal mass that then move by a speed of 2.90×103m/s relative to each other along the original line of motion. How much energy was supplied with the explosion? [Hint: What is the change in kinetic energy as a result of the explosion?]
A 2.93-kg model rocket is launched vertically upward with sufficient initial speed to reach a height of 3.71·102 m, even though air resistance (a nonconservative force) performs -6.11·102 J of work on the rocket.
A hydrogen atom is in its third excited state (n = 4). Using the Bohr theory of the atom, calculate the following. the radius of the orbit. the linear momentum of the electron
A piston, A, as shown below, has a diameter of 0.61 cm. A second piston, B has a diameter of 3.7 cm. Determine the force, F, necessary to support 500.0 N weight in the absence of friction.
A high-speed sander has a disk 4.00 cm in radius that rotates about its axis at aconstant rate of 1265 rev/min. find the angular speed of the disk in radians per second
Your 3.90 kg physics book is next to you on the horizontal seat of your car. The coefficient of static friction between the book, What force does the seat exert on the book in this process
A person walks first at a constant speed of 5.10 m/s along a straight line from point to point and then back along the line from to at a constant speed of 2.95 m/s. (a) What is her average speed over the entire trip? (b) What is her average veloci..
An object is thrown vertically upward and has a speed of 20.0 m/s when it reaches two thirds of its maximum height above the launch point, determine The velocity of the object at maximum height
three forces are applied to a bracket as shown. the directions of the two 30 n forces may vary but the angle between
A ball is tossed from an upper-story window of a building. The ball is given an initial velocity of 8.60 m/s at an angle of 25.0° below the horizontal. Find the height from which the ball was thrown
A car is stopped for a traffic signal. When the light turns green, the car accelerates, increasing its speed from 0 to 4.50 m/s in 0.852 s. What are the magnitudes of the linear impulse and the average total force experienced by a 65.0 kg passenger i..
a. doubling both charges changes the potential energy for a pair of a pint charges by a factor of?b. tripling the
Professor Johnson’s glasses have a front radius of +0.12m and a back radius of -0.08m. What is the focal length of his glasses if the index of refraction of the glass is 1.5?
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