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A train station bell gives off a sound of 500 hertz as a train approaches the station. Assuming the velocity of sound in air is 340 meter per second. Find what will be the approximate speed of the train if the apparent frequency of the bell sound heard by a passenger riding the trail is 540 hertz?
The biochemistry that takes place inside cells depends on various elements, such as sodium, potassium, and calcium, that are dissolved in water as ions. What is the resistance of the ion channel
a bread box is made to move along an x axis from x 0.15 m to x 1.20 m by a force with a magnitude given by f e-2x2
a 2kg block of wood slides on the surface shown. all surfaces are frictionless, except the trough which is rough; the coefficient of kinetic friction there is 0.2 and the trough is 15m long. where will the block come to rest
A pressure of 10 Pa is applied through a piston uniformly on the surface of water in a cylinder. How much of this pressure if it is 80 cm deep?
Two spheres are launched horizontally from a 1.2 -high table. Sphere is launched with an initial speed of 4.5. find the distance that sphere travels from the edge of the table
A small ball rolls off the roof edge of a building with a horizontal speed of 2.3 m/s. the ball hits the ground a distance of 15.8 m from the buildings base. Calculate the following: (neglect any air resistance and spin) A) the height of the building..
What name is given to a galaxy with a smooth distribution of brightness and a round, spherical shape? There is little or no interstellar dust or gas in which of thefollowing galaxy types? Dwarf galaxies contain only dwarf stars.
We want to position a space probe along a line that extends directly toward the sun in order to monitor solar flares. How far from Earth's center is the point on the line where the Sun's gravitational pull on the probe balances Earth's pull?
An astronaut practicing manoeuvring in space is startled to find she has drifted 65.67 m from her spaceship. Fortunately she knows that firing her thrusters’ pistol in the proper direction can get her safely back in no time. If she has a mass of 75.5..
In a television tube, electrons inillially at rest are accelerated by a uniform electric field of magnitude 4 * 10 exp 5 N/C during the first 5 cm of the tube's length, find the speed of the electrons when they hit the screen
q1. a rocket-powered sled starts from rest on a frozen lake that is 8 miles across. the sled then accelerates at 20 fts
Fleas have remarkable jumping ability. A 0.55mgflea, jumping straight up, would reach a height of 40cm if there were no air resistance. What is the flea's kinetic energy as it leaves the ground
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