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Ne4ueva [31]
3 years ago
11

) A 1000 kg car travelling at 50 m/s slams into a 1500 kg parked truck in an inelastic manner as

Physics
1 answer:
solmaris [256]3 years ago
8 0

(a)

KE = m v^2 / 2 = (1200 kg)(20 m/s)^2 / 2 = 240,000 J


(b)

The energy is entirely dissipated by the force of friction in the brake system.


(c)

W = delta KE = KEf - KEi = (0 - 240,000) J = -240,000 J



(d)

Fd = delta KE

F = (delta KE) / d = (-240,000 J) / (50 m) = -4800 N

The magnitude of the friction force is 4800 N.
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Please help me i neeed help with all threeas soon as possible thank you
liberstina [14]

Answer:

4b: comets

5a: supercluster

5b: they just changed 4b's solar system for milky way. I think it is still comets. if not, then just say black holes.

7 0
3 years ago
Plz answer #2 plz this is 8th grade science / physics
MrRissso [65]
All you need is your science book
5 0
3 years ago
What is the force of a 12 kg rock falling at 9.8m/s/s
velikii [3]

F=W=mg
F=12*9.8

F=117.6Newtons

5 0
3 years ago
The circumference of the earth is 40,000 km. The distance from the
Finger [1]

Answer:

The distance from the North Pole to the equator is 1*10^{7}m.

Explanation:

Circumference of Earth = 40,000 km    ......................(1)

Distance from the North Pole to the Equator is =  1/4th of the Circumference of Earth  ......................  (2)

Let Distance from the North Pole to the Equator be  d ,

the equation formed will be ,

d = 1/4 * Circumference of Earth       ........(3)......... ( from equation 1 )

put the value of Circumference of Earth in equation (3),

d = 1/4 * 40,000  km

d = 10,000 km

converting km to m ,

d = 10,000 * 10^{3} m

d =  1 * 10^{7} m

The distance from the North Pole to the equator is 1*10^{7}m.

7 0
3 years ago
8. A car moving at 35 m/s has 675 joules of KE. What is the mass of the car?
andreyandreev [35.5K]
Kinetic energy is the energy possessed by a body in motion while potential energy is the energy of a body at rest.
Kinetic energy is given by E=1/2MV² where M is the mass of the body while V is the velocity of the body. 
To get mass we can use the formula M= 2 Ek/V² (Making M the subject)
hence mass  = (2 ×675)÷35²
                     = 1.102 kg 
6 0
3 years ago
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