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An object has an equation of motion given by x = -2t^2 + 2t - 5. What is the displacement of the particle from t = 1s to t = 3s? What is the average velocity over that time range?
A 38.0-kg child swings in a swing supported by two chains, each 2.90 m long. The tension in each chain at the lowest point is 418 N. Find the child's speed at the lowest point
A student is reading a lecture written on a blackboard. The lenses in her eyes have a refractive power of 69.40 diopters, How far (in meters) is the blackboard from her eyes
A sky diver of mass 81.0 kg jumps from a slow-moving aircraft and reaches a terminal speed of 51.5 m/s. What is the acceleration of the sky diver when her speed is 30.0 m/s
A 20kg sled, initially at rest, slides down a hill, which is 20m tall. what is the speed of the sled at the bottom of the hill
a skier of mass m is standing on a slope with an angle of elevation ø. After being given a tiny nudge, the skier slides down the slope, how much energy is lost while the skier slides down the incline
If we observe a stars spectrum and find that the peak power occurs at the border between blue and ultraviolet light, what is the surface temperature of the star in Celsius
A 2kg lunchbox is sent sliding over a frictionless surface, in positive direction of an x axis along the surface. Start at time t = 0, steady wind pushes on the lunchbox in the negative direction of the x axis.
What is the change in entropy for the system. How much force must be applied to climb the hill at the same speed and same air resistance.
A cyclist is using cranks with a length of 17cm and a front sprocket of radius 10cm. while standing up she places her body weight onto the forward pedal. the crank is initially horizontal and the force in the pedal is equal to body weight. cyclist..
A clay vase on a potter's wheel experiences an angular acceleration of 8.21 rad/s2 due to the application of a 17.7-N m net torque. Find the total moment of inertia of the vase
While visiting Planet Physics, you toss a rock straight up at 11m/s and catch it 2.7s later. While you visit the surface, What is the mass of Planet Physics
The initial height of the block is 0.5 m above the lowest part of the slide and the spring constant is 450 N/m. Illustrate what is the block's speed when it is at a height of 0.25 m above the base of the slide?
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