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A car driver has rear ended a truck but claims he was driving the speed limit before hitting the brakes. The driver left a 50m long streak of tire rubber when he slammed on the brakes. The mass of the drivers car is 1000kg. The coefficient of friction between the tire and asphalt is 0.5. The mass of the truck that got hit is 5000kg. The speed limit for the road is 40mph. What was the magnitude of the acceleration of the car? (Remember that magnitudes are always positive). How fast was the car going right before the driver slammed on the brakes?
A pure electric dipole vector points due north, and you are standing some distance due north of the dipole. What would be the electric field intensity there
A 46-cm-long wire with a mass of 10.5 g is under a tension of 52.0 N. Both ends of the wire are held rigidly while it is plucked. What is the speed of the waves on the wire
Two boxes A and B are connected by a lightweight cord (disregard the mass of the cord). Box A is to the right of Box B. The mass of Box A is 10.0 kg. What is the acceleration of each box
A diffraction grating with 610 lines per mm is illuminated with light of wavelength 520nm . A very wide viewing screen is 2.1m behind the grating. How many bright fringes can be seen on the screen
The threshold of dark-adapted (scotopic) vision is 8.0 ? 10-11 W/m2 at a central wavelength of 450 nm. how many photons per second enter the eye
A playground ride consits of a disk of mass M = 47kg and radius R = 1.6 m mounted on a low friction axle. A child of mass m = 18kg runs at speed v =2.7 m/s on a tangential to the disk and jumps onto the outer edge of the disk.
A projectile is fired at 30° above the horizontal. Any effects due to air resistance are negligible. What is the horizontal component of the initial velocity
Two objects attract each other gravitationally with a force of 2.3×10-10 when they are 0.65 apart. Their total mass is 5.0 . Find out their individual masses.
The Hall effect can be used to determine the density of mobile electrons in a conductor. Find the density of mobile electrons in the material
Suppose you want to design a microscope so that for a fixed distance between the two lenses, If you want the distance between the eyepiece and objective to be 35 cm, what should the focal length of the objective be
Two solenoids of radii 2 cm and 5 cm are coaxial. They are each 25 cm long and have 380 and 960 turns, respectively. Find their mutual inductance in mH
A ball is attached to one end of a wire, the other end being fastened to the ceiling. The wire is held horizontal, Find the velocity (magnitude and direction) of the ball just before the collision
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