Answer:
True
Explanation:
When an object is held higher, it has more potential energy because more energy is stored from its higher position to swing further than it would have, had it been held lower.
<span>The correct answer is B. Inverted image. This is because of all the lenses and light refractions and what not. The same things happens with our eyes except our brains fix the inverted image automatically. Since there are no brains in a projector, you have to fix it on your own by putting it in reverse.</span>
<span>Slowing an
object down is not a means of accelerating it. It actually decelerates the
motion of an object. Speeding it up, changing its direction and applying
balanced forces accelerate an object. In order for an object to accelerate, a force
must be applied. It follows Newton’s second law of motion where it states that
a body at rest remains at rest unless a force is acted upon it. When you move
an object, you are exerting a force onto it. By exerting a force on the object,
you are actually displacing it from its initial position. You cannot apply
force to the object without altering its position. Keep in mind that when you
exert work, you are exerting energy too. </span>
Answer:
119 cm
Explanation:
Given heights : 200cm , 188 cm , 175 cm, 160 cm
since the eyes are at 95% level
95% of 200 cm = 190 cm
95% of 160 cm = 152 cm
hence the allowable height of mirror = 200 - ( 5 + 76 ) = 119 cm
and The mirror should be hung 75cm from the floor
Answer:
Object A
Explanation:
given,
Object A
mass,m₁ = 1.4 Kg
speed of the car,v₁ = 14.2 m/s
object B
mass,m₂ = 2 Kg
speed,v₂ = 5 m/s
Kinetic energy of the object will be absorbed by you when it hit you.
![KE_1 = \dfrac{1}{2}mv_1^2](https://tex.z-dn.net/?f=KE_1%20%3D%20%5Cdfrac%7B1%7D%7B2%7Dmv_1%5E2)
![KE_1 = \dfrac{1}{2}\times 1.4 \times 14.2^2](https://tex.z-dn.net/?f=KE_1%20%3D%20%5Cdfrac%7B1%7D%7B2%7D%5Ctimes%201.4%20%5Ctimes%2014.2%5E2)
KE₁ = 141.148 J
kinetic energy of the object B
![KE_2 = \dfrac{1}{2}m_2v_2^2](https://tex.z-dn.net/?f=KE_2%20%3D%20%5Cdfrac%7B1%7D%7B2%7Dm_2v_2%5E2)
![KE_2 = \dfrac{1}{2}\times 2 \times 5^2](https://tex.z-dn.net/?f=KE_2%20%3D%20%5Cdfrac%7B1%7D%7B2%7D%5Ctimes%202%20%5Ctimes%205%5E2)
KE₂ = 25 J
Hence, the Object A will feel worse if hit you because of the kinetic energy of the object A is more.