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A 0.45-kg crow lands on a slender branch and bobs up and down with a period of 1.1 s. An eagle flies up to the same branch, scaring the crow away, and lands. The eagle now bobs up and down with a period of 3.6 s. treating the branch as an ideal spring; discover (a) the effective force constant of the branch and (b) the mass of the eagle.
how many electrons must be removed from each of two 5.0-kg. copper spheres to make the electric force of repulsion
what is the mass of the earths atmoshere (the radius of the earth is 6.37 x 10^6 m, and atomosheric pressure at the surface is 1.013 x 10 ^5 N/m^2)
Pilots of high-performance fighter planes can be subjected to large centripetal accelerations during high-speed turns. Find the ratio of the normal force to the magnitude of the pilot's weight
an electric dipole has charges of 4.55pc that are separated by 6.75cm. the dipole lies on the x-axis its positive end
A 400kg soccer ball approaches a player horizontally with aspeed of 15.0 m/s. What impulse was delivered to the ball by the player
Man pushes a 27-kg block 9.1 m along a level floor at constant speed with a force directed 45° below the horizontal. how much work does the man do on the block
Find the minimum volume of concrete (y = 23.6 kN/m3) needed to keep the gate (1 m wide) in a closed position; l = 2 m. Note the hinge at the bottom of the gate. Explain briefly.
A laser beam aimed from the earth is swept across the face of the moon. what is the angle of divergence of the laser beam
A laser beam (λ = 632.1 nm) is incident on two slits 0.210 mm apart. How far apart are the bright interference fringes on a screen 5 m away from the double slits?
The 22.5 g arrow is shot with a speed of 37.0 m/s and passes through the target, which is stopped by the impact. What is the speed of the arrow after passing through the target
A proton is accelerated from rest through a potential difference of 9.0V. Find the energy of the particle and the speed of the particle Through what potential difference would an electron need to accelerate to achieve a velocity of 1.00 x 10 7m/s?
The systolic pressure is 0.158 atm and the diadtolic pressure is 0.150 atm in the heart. If the volume pumped in one heartbeat is 75cm3 calculate the work done in a heartbeat. Assume a simple dependence of pressure in a ventricle.
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