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A certain atom of has 77 protons. Assume that the nucleus is a sphere with radius 6.73 fm and with the charge of the protons uniformly spread through the sphere. At the nucleus surface what is the magnitude of the electric field produced by the protons?
A very bouncy ball is dropped from a height of 2.37 m to an asphalt playground surface and the height of its 5th bounce is measured to be 1.69 m. Find the coefficient of restitution of the ball for a collision with asphalt.
An object has a volume of 0.25 m^3 and weighs 3000 N. What will be its apparent weight when submerged in water
What resistive force (assumed to be constant) does the wood exert on bullet? How long does it take the bullet to come to rest.
Two objects (m1 = 2.15 kg and m2 = 4.30 kg) sit on a horizontal, frictionless surface and are pushed together with a compressed spring between them. How much energy was stored in the spring
The observer on the right, sees two final images. One image comes directly from the objet. What is the focal length of the concave mirror
When a person inhales, air moves down the bronchus (windpipe) at 17 cm/s. The average flow speed of the air doubles through a constriction in the bronchus. Assuming incompressible flow, determine the pressure drop in the constriction.
A fly appears to be upside down and 3 times its actual size when viewed through a converging lens with a focal length of 14 cm. How far is the fly from the lens
A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. Find the speed of the wagon after the rock is thrown (a) directly forward in one case and (b) directly backward in another
Two blocks with masses m = 16.7 kg and M = 70.1 kg are not attached. The coefficient of static friction between the blocks is 0.45 but the surface beneath M is frictionless. What is the minimum force F required to hold m against M?
What is the magnitude and direction of the net force on the box?
A car is parked on a cliff overlooking the ocean on an incline that makes an angle of 24 degrees below horizontal. Find the length of time the car is in the air
A female orb spider has a mass of 0.45g . She is suspended from a tree branch by a 1.0m length of 0.0020-mm-diameter silk. If you tap the branch and send a vibration down the thread, how long does it take to reach the spider
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