A pillow is thrown downward with an initial speed of 6 m/s.After 4 seconds, the pillow's velocity is m/s. (g= -9.8m/s2)
Answers
The velocity of the pillow after 4 seconds is -45.2 m/sec and this can be determined by using the velocity formula.
Given :
A pillow is thrown downward with an initial speed of 6 m/s.
The equation of velocity is used in order to determine the pillow's velocity after 4 seconds.
v = u + at
where 'v' is the final velocity, 'a' is the acceleration due to gravity, 'u' is the initial velocity, and 't' is the time.
Now, substitute the known terms in the above equation in order to determine the pillow's velocity after 4 seconds.
v = -6 - 9.8 (4)
Simplify the above equation.
v = -6 - 39.2
v = -45.2 m/sec
So, the velocity of the pillow after 4 seconds is -45.2 m/sec.
For more information, refer to the link given below:
Given :
Initial velocity, u = -6 m/s.
Time taken, t = 4 seconds.
Acceleration due to gravity, .( Here negative sign means downward direction )
To Find :
Velocity after 4 seconds.
Solution :
By equation of motion.
v = u + at
Here , a = g.
v = u + gt
v = -6 + (-9.8)×4
v = -6 + (-39.2)
v = -45.2 m/s
Therefore, velocity after 4 seconds is -45.2 m/s.
Hence, this is the required solution.
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Answers
a. 10N
b. 100N
c. 200N
d. 98N
Answers
The smallest value of the force that will make the block not to slide down is 10 N.
We'll begin by calculating the normal reaction. This can be obtained as follow:
- Mass (m) = 8 Kg
- Acceleration due to gravity (g) = 10 m/s²
- Normal reaction (N) =?
N = mg
N = 8 × 10
N = 80 N
Finally, we shall determine the frictional force.
- Coefficient of friction (μ) = 0.4
- Normal reaction (N) = 80 N
- Frictional Force (F) =?
F = μN
F = 0.4 × 80
F = 32 N
Since the frictional force is 32 N, therefore, a force lesser than the frictional force will make the blocknot to slide down.
From the options given above, only option A has a force that is lesserthan the frictional force.
Therefore, the correct answer to the question is Option A. 10 N
Learn more about frictional force:
Final answer:
The smallest value of the force that will not slide the 8.0 kg block down the wall is 31.36 N.
Explanation:
To determine the smallest value of the force such that the 8.0 kg block will not slide down the wall, we need to consider the static friction between the block and the wall. The formula for static friction is fs = μs * N, where μs is the coefficient of static friction and N is the normal force. In this case, the normal force is equal to the weight of the block, which is mg = 8.0 kg * 9.8 m/s^2 = 78.4 N. Therefore, the smallest value of the force is equal to the maximum static friction force, which can be calculated as fs = 0.4 * 78.4 N = 31.36 N. So the correct answer is 31.36 N.
Learn more about Static Friction here:
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Answers
Answer:
Mass, m = 16.02kg
Explanation:
Given the following data;
Force, F = 157N
Since it's a free fall, acceleration, a = g = 9.8m/s² (acceleration due to gravity).
To find the mass;
Force is given by the multiplication of mass and acceleration.
Mathematically, Force is;
Where;
- F represents force measured in Newton.
- m represents the mass of an object measured in kilograms.
- a represents acceleration measured in meter per seconds square.
Making mass (m) the subject of formula, we have;
Substituting into the equation;
Mass, m = 16.02kg
Therefore, the mass of the rock is 16.02kg.
Answers
Here are the following choices:
A) 0.25s
B) 0.40s
C) 2.5s
D) 4.0s
Answers
Answer:
Law of inertia, also called Newton's first law, postulate in physics that, if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.
Hopethisanswerisright!
Answer:
property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force.
b. chemistry.
c. astronomy.
d. epistemology.