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Toni has a mass of 43 kg and is moving with a speed of 11.6 m/s. Assume that air resistance is negligible.
a) Find Toni's kinetic energy.b) Toni's speed changes to 5.8 m/s. Now what is her kinetic energy?c) What is the ratio of the kinetic energies in parts a and b?(kinetic energy in a / kinetic energy in b)Explain.
A 22 child slides down a 2.4 -high playground slide. She starts from rest, and her speed at the bottom is 1.9 What is the change in thermal energy of the seat of her pants
At t1 = 5.00 s, the acceleration of a particle moving at constant speed in counterclockwise circular motion is a1=(2m/s^2)i + (9m/s^2)j At t2 = 6.00 s (less than one period later), the acceleration is a2= (9m/s^2)i - (2m/s^2)j The period is more t..
a string is 33.5 cm long and has a mass per unit length of 5.70 10-4 kgm. what tension must be applied to the string
Two concentric metal spheres are found to have a potential difference of 846.0 V when a charge of 3.586·10-8 C is applied to them. What is the radius of the inner sphere
In April 1974, Steve Prefontaine completed a 10000m race in a time of 1663.6 s. Suppose \"Pre\" was at the 8550m mark at a time of 1500 s. calculate the acceleration that he had
A child's toy consists of a piece of plastic attached to a spring. The spring is compressed against the floor a distance of 2.0 cm and released. If the spring constant is 85 N/m, what is the magnitude of spring force acting on the toy at the moment i..
Consider a concave mirror with a focal length of 18.90 cm. Find the location of the image when the object is 10.20 cm from the mirror. What is the magnification of the image? What is the radius of curvature of the mirror in cm? Is is virtual and u..
Stellar radial velocity variations as small as 1 m/s can be detected with current technology. what is the radius of the widest circular orbit on which jupiter could currently be detected orbiting the Sun
When the centrifuge reaches an angular speed of 2.5 rad/s, the trainee experiences a total acceleration equal to 4.8 times the acceleration due to gravity. Explain how long is the arm of the centrifuge?
High-speed photos of a 200?g flea jumping vertically show that the jump lasts 1.5ms and involves an average vertical acceleration of 110 g, What's the change in the flea's momentum during its jump
A heat pump has a coefficient of performance of 3.85 and operates with a power consumption of 6.88 x 103 W. How much energy does it deliver into a home during 2 h of continuous operation
A nuclear power plant generates 3000 MW of energy from nuclear reactions in reactor’s core. This energy is used to boil water and produce high pressure steam at 300 0C.
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