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You are driving a 1200kg Mini Cooper east on Central. You look down to read a text message from your mom. When you look up you realize that the light is red. You manage to apply your brakes and skid for 0.5 seconds before hitting the 2300kg SUV heading north on Rock Road. The two cars lock together and skid 9.8m in the direction of 25 degrees east of north before stopping. The surface that the cars slide on has an incline of 5 degrees above the horizontal. Police determine that the kinetic friction coefficient between the tires and the road is 0.7. Were you exceeding the 40 mph (17.87 m/s) speed limit before you applied the brakes? Was the SUV speeding before the collision?
a 1.6kg wood block is pulled along a wood floor at a steady speed. a second wood block with mass 4.2kg is attached to
On planet X, the alien residents use a temperature scale in which they define 0 degrees X to be the melting point of nitrogen and 100 degrees X to be the boiling point of nitrogen.
The bottom of an aluminum pot has an area of 157 cm2 and a thickness of 3.25 mm. How many watts are needed to boil water at this rate
a girl is riding her bicycle . when she gets to a corner, she stops to get a drink from her water bottle. how long does it take for her to catch up with her friend
In a model AC generator, a 500-turn rectangular coil 8.0 cm by 20 cm rotates at 120 rev/min in a uniform magnetic field of 0.60 T. what is the maximum emf induced in the coil.
Throughout a hard sneeze, your eyes may shut for 0.44s. If you are driving a car at 98 km/h during such a sneeze, how far does the car move during that time.
An unstable particle called the pion has a mean lifetimeof 25 ns in its own restframe. What is the mean lifetime of the pions as measured in thelaboratory frame
A laser pulse has an energy of 25 J and a beam radius of 2 mm. The pulse duration is 6 ns and the energy density is constant within the pulse. What is the spatial length of the pulse
A person's eyeball has a diameter D (measured from lens to retina). find Where is this person's near point and far point
A transverse harmonic wave travels on a rope according to the following expression: y(x,t) = 0.17sin(2.0x + 17.5t), What is the average speed of the rope during one complete oscillation of the rope
the velocity of light (c) is 3x108 m/s. an AM radio station is at 1500 (kHz) on the radio dial. what is the wavelength of the waves broadcast by this station
a beam of accelerated protons from the large hadron collider can be used to spray paint an insulator with protons.
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