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Keli weighs 456 Newton and she is sitting on a playground swing that hand .5 meter above the ground. Tom pulls the swing back and releases it when the sweat is 1.25 meter above the ground.
a.) Determine how fast is Keli moving when the swing passes through its lowest position?
b.) If Keli moves through the lowest point at 2.2 m/s, find how much work was done on the swing by friction?
A mass is accelerating when it is seen doing what? Now that we know the newton's law, what can beinfered about mass which is accelerating? How can you explain why your car stops quicker when tires continue rotating during braking?
A thermos contains 130 cm3 of coffee at 85° C. To cool the coffee, you drop two 13-g ice cubes into the thermos, What is the final temperature of the coffee
The acceleration due to gravity on the Moon's surface is one-sixth that on Earth. What does it weigh on the moon
The diameters of the main rotor and tail rotor of a single-engine helicopter are 7.67 m and 1.05 m, respectively. The respective rotational speeds are 456 rev/min and 4,130 rev/min.
An automobile engine slows down from 4500 rpm to 1200 rpm in 2.5 s. Calculate: Its angular acceleration, assume. the total number of revolutions the engine makes in this time
A convex mirror has a focal length of -24cm. discover the magnification produced by the mirror when the object distance is (a) 5 cm and (b) 24cm.
After emptying her lungs, a person inhales 4.24 L of air at 0 °C and holds her breath. How much does the volume of the air increase as it warms to her body temperature of 37.1 °C
A 4 kg block is acted upon by three horizontal forces. 10n (to left) 5n(short arrow to right) 25n to right. what is the horizontal acceleration of the block
Observers in a frame S arrange for two simultaneous explosions at time t=0. Find how far apart are the two events as measured in S'
One of the loudest sounds in recent history was that made by the explosion of Krakatoa on August 26-27, what was the decibel level on Rodriguez Island
what would be the appearance of the velocity-time curve if the falling body were so light that the effect of air
q1. a proton travels with the speed of 8.34times105 ms at an angle of 32.3deg with the direction of a magnetic field.
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