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An object is placed in front of a convex mirror, and the size of the image is one-fourth that of the object. What is the ratio do/f of the object distance to the focal length of the mirror?
A.+3
B.-3
C.-2
D.+2
a 15 gram gun fires a bullet a a muzzle velocuty of 600 m/s. What is the recoil velocity of the gun?
A cannon is mounted on a railroad car. The cannon fires a 1.75kg ball with a muzzle velocity 300.m/s to the left. The mass of the cannon-car combo is 4500.kg. if all is initially at rest, what is the recoil velocity of the cannon-car?
A typical light wave has a wavelength of 580 nanometers (580 x 10-9 m).
If the speed of light is 3.0 x 108 m/s what is the frequency of the typical light wave?
Explain how the classical density of states is used to calculate the partition function for systems whose energy levels form a continuum.
Find the acceleration of a 1500.kg car, driven by 2200.N against 450.N of friction
Show that the equation 𝑣=√t/μ
does give the
appropriate units for velocity.
A car moving along straight road at 30m/s slows uniformly to a speed of 10m/s in a time of 5.0s. Determine
(a) acceleration of the car
(b) distance it moves during the third second
A stone is thrown straight upwards and it rises to a maximum height of 20m. With what speed was it thrown?
A car is traveling at 20.0m/s. When the driver slams on the brake and bring it to a straight line stop in 4.2s. What is the magnitude of its average acceleration?
