Answer:
the distance of the top of the window below the windowsill from which the flowerpot fell is 0.31 m
Explanation:
given information:
time, t = 0.420 s
height, h = 1.9 m
the the vertical motion equation:
h =
t + ![\frac{1}{2} gt^{2}](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B2%7D%20gt%5E%7B2%7D)
where
h = height (m)
= initial velocity (m/s)
t = time (s)
g = gravitational force (9.8
)
first we calculate the velocity of the flowers pot when it reaches top window
h =
t + ![\frac{1}{2} gt^{2}](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B2%7D%20gt%5E%7B2%7D)
1.9 =
(0.42) + (
)
= (1.9 - (
))/0.42
= 2.47 m/s
now we can find the distance of the windowsil
+ 2gh
v = 0, thus
2gh = - ![v_{0}^{2}](https://tex.z-dn.net/?f=v_%7B0%7D%5E%7B2%7D)
h = -
/2g
=
/ (2 x 9.8)
= 0.31 m
The correct answer to the question is C) 400 J.
CALCULATION:
As per the question, the force applied on the block F = 40 N.
The distance travelled by the block S = 10 m.
We are asked to calculate the work done by the block.
The work done by a body under a force F is calculated as -
Work done W = ![\vec F.\vec S](https://tex.z-dn.net/?f=%5Cvec%20F.%5Cvec%20S)
= ![FScos\theta](https://tex.z-dn.net/?f=FScos%5Ctheta)
Here,
is the angle between force and displacement.
If
, then work done W = ![FScos0](https://tex.z-dn.net/?f=FScos0)
= FS. [ cos0 = 1]
Hence, the work done by the block W = FS
= 40 N × 10 m
= 400 Joule. [ans]
Here, Joule is the unit of work.
Hence, the work done by the block s 400 Joule.
I would say that the shifting of the material in the ambulance with a change in direction of the ambulance could be due to centrifugal force is turning a corner or also it could be conservation of momentum so that the force it had from the forward movement of the ambulance makes the material keep moving forward even though the ambulance has changed direction of movement,
Answer:
410.254 N
Explanation:
Force: This can be defined as the product of the mass of a body. The Unit of force is Newton (N)
Deduced from the question,
Force applied to the box to start it moving = Force of friction.
Fₐ = F
Where Fₐ = Force applied to the box to start it moving, F = Force of friction.
But,
F = μR.......................... Equation 1
Where R = normal reaction, μ = coefficient of static friction.
R = W = mg ( on a level surface)
Where m = mass of the box = 123 kg, g = acceleration due to gravity = 9.81 m/s²
R = 123×9.81
R = 1206.63 N.
Also, μ = 0.34
Substituting into equation 1
F = 1206.63×0.34
F = 410.254 N.
Thus the force applied to the box to start it moving = 410.254 N
Answer:
<u>Very low</u>
<u>Explanation:</u>
It is fair to say to a reasonable extent that there are very low chances that radio transmissions from Earth or messages sent on distant space probes will ever be received by living beings
.
Bear in mind that for years some scientists have believed without any substantial evidence that there are other living beings in distant space.