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A car starts from rest and travels for 8.0 s with a uniform acceleration of +2.4 m/s2. The driver then applies the brakes, causing a uniform acceleration of -2.0 m/s2. If the brakes are applied for 3.0 s, determine each of the following.
(a) How fast is the car going at the end of the braking period?
(b) How far has it gone?
A container is filled to the brim with 1.6 L of mercury at 20°C. As the temperature of the container and mercury is increased to 49°C, compute the linear expansion coefficient of the material
In the rainy season, the amazon flows fast and runs deep. In one location, the river is 23m deep and moves at a speed of 4.0m/s toward the east. what is the potential (magnitude and sign) at the surface
A ray of light is incident at an angle of 30 deg. to the normal on an air glass interface. find the angle the refracted ray makes to normal
Calculate the magnitude of the electric field at the origin due to the following distribution of charges: -q at (x,y) = (a,a), +q at (a,-a), +q at (-a,-a) and -q at (-a,a)
A hypodermic syringe contains a medicine with the density of water, Determine the medicine's flow speed through the needle
Suppose that after a centrifuge in a medical laboratory is turned off, it continues to rotate with a constant angular deceleration for 10.40 s before coming to rest. How numerous revolutions did the centrifuge complete after being turned off.
A 250g steel ball and a 500g steel ball each hang from 3.0-m-long strings. At rest, the balls hang side by side, barely touching. To What angle does each ball rebound
A box starts from rest and is pushed a distance d = 1.25 meters along a frictionless ramp by a horizontal force, Fa, in 9.75 seconds. find the acceleration of the box as it slides up the ramp
A uniform plank of length 2m and mass 29kg is supported by three ropes, as indicated by the blue vectors. Find the tension in each rope when a 690N person is 0.500m from the left end.
A bird is flying directly toward a stationary bird-watcher and emits a frequency of 1230 Hz. The bird-watcher, however, hears a frequency of 1260 Hz. What is the speed of the bird, expressed as a percentage of the speed of sound?
Two disks are mounted on frictionless bearings on the same axle and can b brought together so that they can couple and rotate as one unit. what is the angular speed after coupling
A circuit contains six 210 lamps and a 14 heater connected in parallel. The voltage across the circuit is 120V. If the circuit has a 12A fuse, will the fuse melt if all the lamps and the heater are on.
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