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A motorist is traveling at 25m/s. He is 50 m from a stop light when he sees it turns yellow. His reaction time, before stepping on the brake is 0.45 s.
What steady deceleration while braking will bring him to a stop right at the light?
An astronaut weighs 7*10^2 N on the surface of the earth (M earth=5.98*10^24 kg). What is her weight 7.70*10^6 m above the earth.
In a belly-flop diving contest, the winter is the driver whomakes the biggest splash upon hitting the water. The size of thesplash depends not only on the drivers style, but also on theamount of kinetic energy that the driver has.
A student is reading a lecture written on a blackboard. The lenses in her eyes have a refractive power of 56.11 diopters, and the lens-to-retina distance is 1.791 cm. (a) How far is the blackboard from her eyes? (b) If the writing on the blackboard i..
A marble slide towards a 2nd marble at rest along the surface of frictionless table-top. What is the velocity of the 2 bodies after collision
Two timpani (tunable drums) are played at the same time. One is tuned so that when it is struck, sound is produced that has a wavelength of 2.20 m. what beat frequency is heard
Argon is a monatomic gas whose atomic mass is 39.9 u. The temperature of 9 grams of argon is raised by 75 K under conditions of constant pressure. Assuming that argon is an ideal gas, evaluate how much heat is required? J
A stone is thrown with an initial speed of 15 m/s at an angle of 53 degrees above the horizontal from the top of a 35m building. What is speed of rock as it hits the ground
At a crime scene, the forensic inestigator notes that 7.5-g leadbullet that was stopped in a door-frame apparently meltedcompletely on impact. Assuming the bullet was fired at roomtemperature of 20°C, what does the investigator calculate theminimum m..
Suppose that the amount of heat removed when 2.8 kg of water freezes at 0.0 oC were removed from ethyl alcohol at its freezing/melting point of -114.4 oC. How many kilograms of ethyl alcohol would freeze
you have encouraged your little sister, who has just gotten glasses for her severe near-sightedness, to give you those glasses so you can play with them. If your sister's face is 180. mm-tall, how tall will it appear to be in the image (in mm)
a diver leaves a 3 m- board on a trajectory that takes her 2.2 m above the board and then into the water 2.7 m
A 11.45 Volt battery with internal resistance R1 = 0.1373 is said to be charged by a battery charger that is capable of delivering a current i= 9.7959 Amp. Find the minimum emf the battery charger must be able to supply in order to charger the bat..
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