HELP! When you hold a rectangular object, how does the area of the side that is resting on your hand affect the pressure and the
2 answers:
Answer:
The larger the area, the lower the pressure. The force does not depend on the area
Explanation:
- The force exerted by the object on your hand does not depend on the area of contact between the object and the hand, but only on the weight of the object:
where mg is the weight of the object.
- The pressure exerted by the object on your hand is given by:
where F is the force and A is the area of contact between the object and the hand. From this equation, we see that when the area of contact A is larger, the pressure p exerted on your hand is lower, and vice-versa.
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Answer: 0.016 h
Explanation:
It is given that, biker has an average speed = 18 km/h
Total distance traveled = 0.30 km
Therefore, time taken by biker to travel this distance:
Thus, the biker takes 0.016 hours to travel the segment of 0.30 km at an average speed of 18 km/h.
Complete Question
A coal train in Montana starts from rest and accelerates at 2.5m/s^2 for 15 Find the trains maximum velocity
Answer:
The maximum velocity is
Explanation:
From the question we are told that
The acceleration is
The time for the acceleration is
Generally from the kinematics equation
here u is the initial velocity and the value is 0 m/s given that it started rom rest
1) The final velocity of the object is -78 m/s (downward)
2) The final height of the object is -290 m
Explanation:
1)
When the object is thrown up, it follows a free fall motion, subjected only to the force of gravity (that pulls the object downward). Therefore, the object has a constant acceleration
towards the ground (acceleration of gravity).
Since this is a motion with constant acceleration, we can use the following suvat equation:
where
v is the final velocity
u is the initial velocity
a = g is the acceleration
t is the time of flight
In this problem we have:
u = +20 m/s (taking upward as positive direction)
t = 10 s is the time of flight
(downward, so negative)
Solving for v, we find the final velocity:
2)
For this part of the problem, we can use another suvat equation:
where
u is the initial velocity
a is the acceleration
t is the time
s is the displacement of the object
In this problem,
u = +20 m/s
t = 10 s
Substituting, we find the final position of the object with respect to the initial position:
Learn more about uniform accelerated motion:
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