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The driver of a truck comes suddenly upon a fallen tree that has blocked the road ahead. A total time interval of 5.45 seconds elapses during which the driver recognizes the hazard, determines the need to brake, hits the pedal, and ultimately slams into the tree. The driver's reaction time uses the first 1.25 seconds of the total time. Once the brakes engage the truck experiences a constant 5.60 m/s^2 deceleration. The truck leaves skid marks on the road surface 62,4 m in length beginning where the brakes first engage and ends at tree. At what speed does truck hit tree and how far does the truck travel during the initial 1.25 second response interval (assume constant velocity)?
Suppose the same experiment is run with a different light source. If the first-order maximum is found at 1.90 cm from the centerline, what is the wavelength of the light
A 2.00m -long, 550g rope pulls a 13.0kg block of ice across a horizontal, frictionless surface. The block accelerates at 2.20m/s2 . How much force pulls forward on (a) the ice, (b) the rope?
Sound propagating during air at 30 degrees Celsius passes through a vertical cold front into air that is 4.0 degrees Celsius. if the sound has a frequency of 2400 Hz, by what percentage does its wavelength change in crossing the boundary?
An object of mass 1.2 kg hangs from the end of a spring. Imagine that the object is lifted upward and held at rest at the position where the spring is not stretched. What is the amplitude of the oscillation
a water pipe having a 2.4 cm inside diameter carries water into the basement of a house at a speed of 0.93 ms and a
A circular disk has surface charge density 8.0nC/cm^2. What will the surface charge density be if the radius of the disk is doubled? Express your answer to two significant figures and include the appropriate units.
If a wheel 214centimeter in diameter takes 2.75second for each revolution, calculate its angular speed and period
an ideal gas has a pressure of 2.5, a volume of 1.0L at a temperature of 30degress C. How many molecules are there in the gas
The filament in an incandescent light bulb is made from tungsten. The light bulb is plugged into a120 V outlet and draws a current of0.76 A. If the radius of the tungsten wire is 0.0024 mm, how long should the wire be?
A 3.80-kg cylindrical rod of length 2.00 m is suspended from a horizontal bar so it is free to swing about that end. What is the angular velocity of the rod immediately after the collision
question a 140g arrow is shot vertically from a bow whose effective spring constant is 500 nm. if the bow is drawn 60cm
A microscope by a tube length of 200 achieves a total magnification of with a objective and a eyepiece. The microscope is focused for viewing by a relaxed eye. How far is the sample from the objective lens?
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