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An amazing parent pushes their child's sled (total mass = 65kg) so that the sled is moving at 5 m/s at the top at the sledding hill which makes a 20 degree angle with the horizontal. Using the work-energy theorem, calculate the speed of the sled after it has traveled 25 m along the trail. (Neglect friction)
A small drop of water is suspended motionless in air by a uniform electric field that is directed upward and has a magnitude of 6880 N/C. How many excess electrons or protons reside on the drop
A 85.0 kg fullback is running at 3.86 m/s to the east and is stopped in 0.800 s by a head-on tackle by a tackler running due west. Calculate the impulse exerted on the tackler
An arrow is fired with a speed of 23 m/s at a block of Styrofoam resting on a smooth surface. The arrow penetrates a certain distance into block before coming to rest relative to it. All through this process the arrow's deceleration has the magnit..
our little sister builds 2 tree houses and stretches a rope between them for sending messages to other tree house. She hangs a mass of 1.4kg on one end of the rope that passes over the pulley.
A binary star system has two stars, each with the same mass as our sun, separated by 1.20×1012m. What is the comet's speed at the midpoint
a 15-kg block rests on a level frictionless surface and is attatched by a light string to a 5.0-kg hanging mass, what is the tension in the connecting string
question1a space platform in form of a thin circular disc of radius a and mass m flying saucer is initially rotating
Bruce stands on a bank beside a pond, grasps the end of a 10.00-m long rope attached to a nearby tree and swings out to drop into the water. If the rope starts at an angle of 36° with the vertical, what is Bruce's speed at the bottom of swing.
A spherical concave lens has a focal length of 40 cm, and an object is placed 20 cm from the lens. Draw a ray diagram. (Submit a file with a maximum size of 1 MB.) Estimate the image distance
What is the magnitude of the acceleration of a modified Atwood machine if the mass of the cart is 3 kg and the hanging mass is 4 kg? (Use g = 9.8 m/s2. Express your answer to one decimal point.)
A professor's office door is 0.96m wide, 2.2mhigh, 4.0cm thick; has a mass of 26kg , and pivots on frictionless hinges. what is its angular acceleration immediately afterward
A 400 g mass is suspended from a thread 45 cm long that can sustain a maximum tension of 8.0 N before breaking. What is the maximum allowable amplitude for pendulum motion of this system
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