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A 41.0 kilogram ballet dancer stands on her toes during a performance with four square inches (26.0 cm2) in contact with the floor. Evaluate the pressure exerted by the floor over the area of contact in the following cases?
(a) if the dancer is stationary
Pa
(b) if the dancer is leaping upwards with an acceleration of 3.00 m/s2
a pendulum of length L = 48.8 cm and mass m=169g is released from rest when the cord makes an angle of 65.4 with the vertical
A concave spherical mirror with a focal length of 15cm forms an upright image that is 5 times larger than the original object
For a particular scientific experiment, it is important to be completely isolated from any magnetic field, including the earth's field. What is the current in the current loop
A 15m long rope of m=1.8kg is stretched such that the tension in the rope is 25N. calculate the displacement of a particle in the rope at t=10s, when the wave is at x=0.5m
Estimate the power radiated by a basketball at 20 deg C and a human body at 37 deg C. Use Stefan-Boltzmann Law
Nonreflective coatings on camera lenses reduce the loss of light at the surfaces of multilens systems and prevent internal reflections that might mar the image. Find the minimum thickness of a layer of magnesium fluoride
A stationary radar operator determines that a ship is 17 km south of him. An hour later the same ship is 21 km southeast. If the ship moved at constant speed and always in the similar direction, what was its velocity during this time.
a sailboat is being propelled westerly by the wind at a speed of 4 ms. if the current is flowing at 2 ms to the
calculate the q value in mev for the double beta decay of 128te atomic mass 127.904461 a.m.u. to 128xe atomic mass
a slab of insulating material has thickness 2d and is oriented so that its faces are parallel to the yz-plane and given
The wheel of a bicycle have an angular velocity of +20.0 rad/s. Then, the brakes are applied. In coming to rest, each wheel makes an angular displacement of +15.92 revolutions.
Astronaut Benny travels to Vega, the fifth brightest star in the night sky, leaving his 35.0-year-old twin sister Jenny behind on Earth. How much does Benny age when he arrives at Vega
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