Answer:
The 1st and the 3rd answer
The acceleration of gravity toward any object depends on its mass
and your distance from its center.
In space, the size AND DIRECTION of 'g' depends on the masses
around you and your distance from the center of each one.
If there's one object ... like a planet or a star ... that's bigger than
any others and closer to you than any others, then you can ignore
the others and just calculate the acceleration of 'g' toward that one
object that drowns out the others.
Example:
If you're in space only a few hundred miles from the surface of the
Earth, like maybe on board the International Space Station, then the
'g' on you is practically all due to the Earth and the sun, and you can
ignore the effects of gravity pulling you toward Jupiter, toward the Moon,
and toward the space station itself.
Answer:
(A) 111.77m
(B) 9.07m
(C)55.88m/s
(D)20.54m/s
Explanation:
step 1 " we have to calculate the time it took the projectile to get to its maximum height
(a) t = usinθ/g
= 49sin 33/9.81
49×0.5446/9.81
=2.72s
the horizontal distance = ucosθ×t , because the projectile horizontal motion is unaffected by the force of graavity
= 49cos33 ×2.72
=111.77m
(B) with the same projectile fired the same way , the horizontal distance = 55.8m
55.8 = ucosθ×t
55.8 = 49cos33 ×t
t = 55.8/49cos33
t= 1.36s
height of the projectile = 1/2 ×g×t²
=1/2 ×9.81×1.36²
= 9.07m
(c) Velocity of the projectile when it hits the wall
V₀ = ucosθ×t
49cos 33 × 1.36
=55.88 m/s
(D) speed = distance / time
distance /2×t ; total time of flight
= 55.88/ 2.72
=20.54m/s
Answer:
N₂ = 503.8 N
Explanation:
given,
mass of bottom block = 37 Kg
mass of middle block = 18 Kg
mass of the top block = 16 Kg
force acting on the top block = 170 N
force on the block at top
N₁ be the normal force from block at middle
now,
N₁ = 170 + m g
N₁ = 170 + 16 x 9.8
now, force on block at middle
N₂ be the normal force exerted by the bottom block
N₂ = N₁ + m₂ g
N₂ = 326.8 + 18 x 9.8
N₂ = 503.8 N
hence, normal force by bottom block is equal to N₂ = 503.8 N
<u>Absorb:</u>
Shine a light with known intensity into the object.
Measure the intensity of the light that comes out.
Any light that goes in but doesn't come out the other side
was absorbed by the object.
(Note: You also need to be aware of any light that bounces back from
the first side without entering the object. That light is <em><u>reflected</u></em> from it,
and can't be expected to show up at the other side.)
<u>Transmit:</u>
Any light that goes in and DOES come out the other side
was transmitted by the object.
