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The nucleus of a helium atom contains two protons that are approximately 2.0 fm apart. How much work must be done by an external agent to bring the two protons from an infinite separation to a separation of 2.0 fm?
A proton and an electron have the same kinetic energy upon entering a region of constant magnetic field. What is the ratio of the radii of their circular paths
In February 2004, scientists at Purdue University used a highly sensitive technique to measure the mass of a vaccinia virus (the kind used in smallpox vaccine). What is the mass of the virus in femtograms
a ball is thrown straight up with a speed of 30 ms. a. how long does it take the ball to reach the maximum height? b.
Sea birds tuck in their wings and dive straight down into the water when hunting for fish near the surface. If a pelican starts a dive from 16.0 m, with what speed will it strike the water
Some bacteria are propelled by biological motors that spin hair-like flagella. What is the angular speed (the magnitude of the angular velocity) of this bacterial motor
A bullet is fired through a board 9.0 cm thick in such a way that the bullet's line of motion is perpendicular to the face of the board. Find the total time the bullet is in contact with the board
A skier slides horizontally along the snow for a distance of 21 m before coming to rest. how fast was the skier going
a ski trail makes a vertical descent of 78.0 m as shown in the figure below . a novice skier unable to control his
A small object carrying a charge of -6.00 nC is acted upon by a downward force of 19.0nN when placed at a certain point in an electric field. What would be the magnitude and direction of the force
An 63 kg weight watcher wishes to climb a mountain to work o? the equivalent of a large piece of chocolate cake rated at 690 kcal (1 kcal = 1000 cal). How high must the person climb
A golfer imparts a speed of 28.7m/s to a ball, and it travels the maximum possible distance beforelanding on the green. How much time does the ball spend in the air
A plane mirror and the concave mirror (f = 8.70 cm) are facing each other and are separated by a distance of 23.0 cm. An object is placed between the mirrors and is 11.5 cm from each mirror.
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