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A soccer player extends her lower leg in a kicking motion by exerting a force with the muscle above the knee in the front of her leg. She produces an angular acceleration of 30.0 rad/s2 and her lower leg has a moment of inertia of 0.750 kg·m2. What is the force exerted by the muscle if its effective perpendicular lever arm is2.00 cm?
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The mass of a newborn baby's brain has been found to increase by about 1.6 mg per minute. How much does the brain's mass increase in one day
An unstretched elastic spring has a mass M = 3.75 kg and a length of l0 = 0.525 m. What is the elastic potential energy of the spring
To determine the specific heat of an object, a student heats it to 100 in boiling water. She then places the 68.5 object in a 196 aluminum calorimeter containing 135 of water. what is the specific heat of the object
Julie throws a ball to her friend Sarah. The ball leaves Julie's hand a distance 1.5 meters above the ground with an initial speed of 22 m/s at an angle 63 degrees, What is the distance between the two girls
A rectangular fish tank measures 20 cm by 70 cm by 40 cm high. The tank is filled with water to a depth of 37 cm. What is the total force of the water on the bottom
When the space shuttle (mass of the shuttle=2*10^6kg) was at the outer limit of Earth's atmosphere (distance= 350km above Earth's surface), astronauts measured the gravitational force from Earth to be equal to 1.7*10^7 newtons. Find the gravitatio..
Two girls decide to jump off a diving board. Katherine steps off the diving board. Anna runs straight off the diving board so that her initial velocity is solely horizontal. They both leave the diving board at the same time. Which one lands in the..
A toy car is driven by a battery of 9V. it draws a current of 2mA. what is the resistance of the car
A 2030- test rocket is launched vertically from the launch pad. Its fuel (of negligible mass) provides a thrust force so that its vertical velocity as a function of time is given by, What was the initial thrust due to the fuel
A 45.0 g ball of copper has a net charge of 2.1 µC. What fraction of the copper's electrons have been removed
You can think of the work?kinetic energy theorem as a second theory of motion, parallel to Newton's laws in describing how outside influences affect the motion of an object. Use the work-kinetic energy theorem to find the net work that is done on t..
A car is driven 175km west and then 55km southwest. What is the displacement of the car from the point of origin (magnitude and direction).
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