Can anyone help me with these questions. Please show work when answering. A nonz
ID: 1418933 • Letter: C
Question
Can anyone help me with these questions. Please show work when answering.
A nonzero net force acts on an object. Is it possible for any of the following quantities to be constant: the particle's speed? the particle's velocity? the particle's kinetic energy? Answer using both Newton's 2nd Law and the Work-Energy Theorem. When a certain force is applied to an ideal spring, the spring stretches a distance x from its unstretched length and does work W. If instead twice the force is applied, what distance (in terms of x) does the spring stretch from its unstretched length, and how much work (in terms of W) is required to stretch it this distance? Tendons are strong elastic fibers that attach muscles to bones. To a reasonable approximation, they obey Hooke's Law. In laboratory tests on a particular tendon, it was found that, when a 250-gram object was hung from it, the tendon stretched 1.23 cm. Find the force constant of this tendon in N/m. Use the work-energy theorem to solve each of these problems. You can use Newton's laws to check your answers. Neglect air resistance in all cases. A branch falls from the top of a 95.0m tall redwood tree, starting from rest. How fast is it moving when it reaches the ground? A volcano ejects a boulder directly upward 525m into the air. How fast was the boulder moving just as it left the volcano? A skier moving a 5.00m/s encounters a long, rough horizontal patch of snow having coefficient of kinetic friction 0.220 with her skis. How far does she travel on this patch before stopping? Suppose the rough patch in part (c) was only 2.90m long? How fast would the skier be moving when she reached the end of the patch? At the base of a frictionless icy hill that rises at 25.0 degree above the horizontal, a sled has a speed of 12.0m/s toward the hill. How high vertically above the base will it go before stopping? A 75-kg roofer climbs a vertical 7.0m ladder to the flat roof of a house. He then walks 12 m on the roof, climbs down another vertical 7.0m ladder, and finally walks on the ground back to his starting point. How much work is done on him by gravity: as he climbs up? as he climbs down? as he walks on the roof and on the ground?Explanation / Answer
(a) and (c) are correct
accoding to Newton's second law
F = ma
since F is not equal to zero it's speed and kinetic energy be constant but not velocity
(2)
from the Hook's law
F =kx
x = F/k
since k is constant x is proprtional to F
when F is doubled x is also doubled
W = 1/2 k x^2
W'= 1/2 * k ( 2x)^2
= 4 ( 1/2 kx^2)
= 4W
the required work done is equal to 4 times to initial work done
(3)
F = kx
mg= kx
k = mg/x
0.250 kg ( 9.8) = k ( 0.0123 m)
k = 199.18 N/m
As per guide liens I woked first three parts please post remaining posts in the next post
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