The heat rising from the deseret floor and heat waves make the mirage.
The scale reading increases by the weight of 200 g of mass. (If you're on Earth, that's about 2 Newtons.)
<em>magnetic force is non contact force..
air resistance is contact force
tension is a contact force..
correct option is magnetic force..</em>
- mechanical energy is conserved in all the listed situations
- true
- potential energy
- 490 J
- 750,000 J
EXPLANATION
1. sum of kinetic energy (KE) and potential energy (PE) is known as mechanical energy
- kinetic energy is the motion of an object
- potential energy is the position of an object
there is kinetic energy and other energies in the listed situation.
2. since the height decreases due to the fall, the potential energy also decreases but the speed increases and kinetic energy simultaneously increases so the potential energy is converted to kinetic energy.
3.the energy consumed by an object due to its position is known as potential energy
4. potential energy
PE = m g h
m = 10 kg mass of the object
g = 9.8 m/s^2 acceleration of gravity
h= 5 m height of the object from ground
substituting every value in the formula
PE = (10)(9.8)(5)
PE= 490 J
5. potential energy
PE = m g h
but given is the weight and the height of the elevator
W= 1500 N
h= 500 m
but weight of the object is equal to the product of acceleration of gravity and mass of the elevator
so, W = mg
so we can rewrite the formula as PE = Wh
PE = (1500)(500)
PE= 750,000 J
Answer
given,
speed = 70 mph
time = 52 s = 52/3600 hr = 0.01444 hr
distance travel by Shannon = ?
we know
d = s x t
d = 70 x 0.01444
d = 1.011 miles
distance travel is greater than distance measured by the speedometer.
So, the speed showed by the speedometer is Low i.e. distance is reading on the speedometer is less.
