PLEASE HELP ASAP PHYSICS QUESTION!! I’LL MAKE YOU BRAINLIEST
What force is acting on the crate once it hits the flat part at the bottom of the ramp? What is the magnitude and direction of that force? (picture included for context)

Assuming this is a continuation of an earlier question [20398149], the crate starts at rest and is allowed to slide down the ramp with acceleration a = 2.35 m/s², so the block will have some speed as it reaches the bottom of the ramp and it will continue to slide some distance along the flat part.

If the flat part is made of the same material as the ramp, then in addition to its own weight and the normal force, the crate will also feel some friction that slows down its leftward slide.

• The crate's weight and the normal force act vertically, so that

∑ F = n - w = 0

n = w = mg = (100 kg) (9.8 m/s²) = 980 N

(where ∑ F = net force, n = magnitude of normal force, w = crate weight, m = crate mass, g = mag. of gravitational acceleration)

• The friction acts horizontally, so

∑ F = -f = m a

(where f = mag. of friction and a = crate acceleration)

The surface has a coefficient of kinetic friction of µ = 0.3, so

f = µ n = 0.3 (980 N) = 294 N

So at the bottom of the ramp, there are 3 forces exerted on the crate:

• its weight of 980 N pointing downward

• the normal force of the surface pushing upward on the crate, also of 980 N

• friction of 294 N, pointing to the right

and the two vertical forces cancel each other.

answer: 802.3 kilo joules of energy represents 191.75 kilo calorie of energy.

explanation:

energy released during combustion of one mole methane = 802.3 kilo joules

if 1 kilo joule = 0.239006   kilo calorie

then ,802.3 kilo joule will be = 802.30.239006 kilo calorie

802.3 kilo joule = 191.75 kilo calorie

hence, the energy in kilo calorie is 191.75 kilo calorie.

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