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In this section assume the temperature is 20unless directed otherwise. A submarine 79 deep emits a sonar (sound) wave. The wave reflects from the bottom and returns to the submarine 1.34 after it was emitted. How deep is the ocean at that point?
A 1.6-rm MHz sound wave travels through a pregnant woman's abdomen and is reflected from the fetal heart wall of her unborn baby. The heart wall is moving toward sound receiver as the heart beats.
What is the gravitational energy of stone-Earth System
A large truck collides head-on with a small car. The car is severely damaged as a result of the collision. According to Newton's third law, how do the forces acting between the truck and car compare during the collision?
Her speed when she is above the bar is 1.3 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and find out her altitude as she crosses the bar.
Megan's mass is 28kg. She climbs the 4.8m ladder of a slide and reaches a velocity of 3.2m/s at the bottom of the slide. How much work was done by friction on Megan? Assume that air resistance is negligible.
For lead 82Pb206 (atomic mass = 205.974440 u) obtain the mass defect in atomic mass units
the snow exerts a retarding force on the sled that points opposite to the direction of motion, and has a magnitude of 57 N. Find out the acceleration of the sled and child.
A solid, rectangular iron bar measures .40cm by 1.0cm by 30cm. Find the resistance between each of the three pairs of opposing faces, assume the faces in question are quipotentials.
What is the magnitude of the force of upper leg on the lower leg at the knee joint.
.A cosmic-ray proton in interstellar space has an energy of 10.0 MeV and executes a circular orbit having a radius equal to that of Mercury’s orbit around the Sun (5.80 m). Illustrate what is the magnetic field in that region of space?
A charged paint is spread in a very thin uniform layer over the surface of a plastic sphere of diameter 14.0cm , giving it a charge of -11.0μC. Find the electric field just outside the paint layer
The terminals of a 0.900V watch battery are connected by a 90.0?m?long gold wire with a diameter of 0.200mm, compute the current in the wire
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