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During a drag race, a car is initially at rest on a long straight track. At t = 0 the car accelerates from rest at a constant rate 4.0 m/s2for 10.0 sec and then decelerates at a constant rate of -8.0 m/s2 until it comes to a complete stop.
a) Find the speed of the car at the moment it begins to decelerate? (in m/s)
b) Find how far does the car travel from the time that it starts moving until it comes to a complete stop?
c) Find the average speed of the car from the time that it starts moving until it comes to a complete stop? (in m/s)
initially unpolarized light is sent into a system of three polarizing sheets whose polarizing directions make angles of ?1 = ?2 = ?3 = 51° with the direction of the y axis, What percentage of the initial intensity is transmitted by the system
Hearing damage may occur when a person is exposed to a soundintensity level of 90.0 dB (relative to the threshold of humanhearing) for a period of 9.00 hours
When the distance is 0.20m the tension is 628 N, horizontal pivot force is 581 N and the vertical pivot force is 839N. What is the mass of the bell
At an instant when a soccer ball is in contact with the foot of the player kicking it, the horizontal or x component of the ball's acceleration is 940 m/s2 What is the magnitude of the net force acting on the soccer ball at this instant
You are 1.9 m tall andstand 3.4 m from a planemirror that extends vertically upward from the floor. On the floor1.6 m in front ofthe mirror is a small table, 0.85 mhigh. What is the minimum height the mirror must have for you to beable to see the top..
A certain metal with atomic mass 2.6 × 10?25 kg has an interatomic bond with length 2.5 × 10?10 m and stiffness 45 N/m. What is the speed of sound in a rod made of this metal
The objective lens in a microscope with a 21.0 cm long tube has a magnification of -50.0 and the eyepiece has a magnification of 15.0. What is the focal length of the objective
in a television set electrons are accelerated from rest through a potential difference of 24 kv. the electrons then
The fastest recorded pitch in Major League Baseball was thrown by Nolan Ryan in 1974. If this pitch were thrown horizontally, How fast was Ryan's pitch
A circular coil (980 turns, radius = 0.043 m) is rotating in auniform magnetic field. At t = 0 s, the normal to the coilis perpendicular to the magnetic field. At t = 0.013 s,the normal makes an angle of 45o with the field becausethe coil has made ..
A 3.9 A current is set up in a circuit for 5.9 min by a rechargeable battery with a 9.0 V emf. By how much is the chemical energy of the battery reduced?
A vertical straight wire carrying an upward 24?Acurrent exerts an attractive force per unit length of 5.9×10?4N/m on a second parallel wire 7.5cm away
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