Answer:
705.6 N
Explanation:
The object is hanging on the rope, so there are two forces acting on the object:
- The force of gravity, downward, equal to
W = mg
where m is the mass of the object and g the acceleration of gravity
- The tension in the rope, T, upward
Since the object is hanging motionless, the object is in equilibrium, so we can write:
And therefore
For this problem,
m = 72 kg
Substituting,
Answer:
(b) To get m3 to slide, m1 must be increased, never decreased.
Explanation:
Lab experiments require attentiveness. If there is one thing missed or not taken seriously whole experiment could go wrong. In this case to slide m3 there should be more weight at m1. If the weight of m1 is lesser than m3 then the object will not slide. It will remain at the point where there is more weight. To slide an object there must be less frictional surface and more weight placed at the desired end point.
Work is done when a force is in the same direction as the object moves.
Explanation:
The work done by a force in moving an object is given by the equation
where
F is the magnitude of the force
d is the displacement of the object
is the angle between the directions of F and d
From the equation, we notice the following:
- Work is done by a force when the force is in the same direction as the object moves. In fact, in this case, , and so , which means that the work done simply becomes
- When the force is perpendicular to the motion of the object, and , which means that no work done
- Technically, work is also done when the force is not parallel to the motion of the object: in this case, the factor means that only the component of the force parallel to the direction of motion contributes to do work on the object.
Therefore, the correct answer is
Work is done when a force is in the same direction as the object moves.
Learn more about work:
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Answer:
The the magnitude of the maximum velocity and acceleration are 16.93 m/s and .
Explanation:
Given that,
Rate = 2940 rev/min
Amplitude = ±5.50 cm
(a). We need to calculate the magnitude of the maximum velocity
Using formula of maximum velocity
Where, A = amplitude
Put the value into the formula
(b). We need to calculate the maximum acceleration
Using formula of maximum acceleration
Hence, The the magnitude of the maximum velocity and acceleration are 16.93 m/s and .
<h3><u>Answer;</u></h3>
A. Congress
<h3><u>Explanation;</u></h3>
- <em><u>Article II, Section 1 of the Constitution set up the office of President. It states that the executive power shall be vested in a President of the United States.</u></em>
- The Constitution explains the duties and responsibilities of the President. The President is responsible for the executive branch. The President's main duty is to see that laws are carried out.
- <em><u>The President must take action to solve problems in areas such as civil right issues, transportation needs and safety concerns, with the approval of Congress</u></em>.