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3 years ago

WILL GIVE BRAINLIEST

Physics

1 answer:

SpyIntel [72]3 years ago

6 0

Answer:

The force exerted by the brakes is 14,400,000 N

Explanation:

Initial kinetic energy of truck = 72 MJ

Work done by the breaks, W = Force exerted by the brakes × Distance, D, the truck came to stop

The distance, D, in which the truck came to a stop is given as 5 meters

Given that the initial kinetic energy, KE of the truck that was reduced by the breaks = The work done by the brakes

We have;

W = ΔKE = Change in kinetic energy

ΔKE = Initial kinetic energy - Final Kinetic Energy

Initial kinetic energy, KE = 72 MJ

Final Kinetic Energy = 0 J (Truck stopped)

ΔKE = 72 - 0 = 72 MJ

Therefore we have;

Force exerted by the breaks = W/D = 72 MJ/5 = 14.4 MN. = 14,400,000 N.

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In which type of reaction is matter created?

NemiM [27]

Answer:

Matter can not be created or destroyed, it only changes forms.

Explanation:

conservation of matter

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3 years ago

18. Compared to its weight on Earth, a 5 kg object on the moon will weigh A. the same amount. B. less. C. more.

s2008m [1.1K]

Answer:

B. less

Explanation:

acceleration due to gravity on Earth, g = 9.8 m/s²

acceleration due to gravity on Moon, g = 1.6 m/s²

Given mass of the object as, m = 5 kg

Weight of an object is given as, W = mg

Weight of the object on Earth, W = 5 x 9.8 = 49 N

Weight of the object on Moon, W = 5 x 1.6 = 8 N

Therefore, the object weighs less on the moon compared to its weight on Earth.

The correct option is "B. less"

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3 years ago

Two long, parallel wires are separated by a distance of 2.00 cm . The force per unit length that each wire exerts on the other i

RUDIKE [14]

Answer:

a) current in the second wire is 5.60A

b) opposite directions

Explanation:

a) We need to find the current of wire, the magnitude of the force per unit length between the two wires carrying current I and I¹ is given by

$\frac{F}{L} = \frac{U_0I^1}{2\pi r} \\\\I^1 = \frac{F2\pi r}{LU_0I}$

$= (3.6 * 10^-^5)\frac{2\pi (0.02)}{4\pi * 10^-^7)(0.64)} \\= 5.60A$

b) knowing that for a two parallel conductor carrying current in the same direction attracts each other, and for a two parallel conductors carrying carying current in opposite direction repels eachother.

therefore, since the two wire repel each other then the current in the second wire must flow in the opposite direction of the current in the first wire.

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4 years ago

an object tied to the end of the string moves in a circle . the force exerted by the string depends on the mass of the object it

otez555 [7]

Answer:Fc=mv^2/r

Explanation:

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4 years ago

Place the two thermometers outdoors in different locations. Place one in direct sunlight and the other in shade. Make sure that

Archy [21]

Yes

Explanation:

There would be a difference in temperature between the two places over the time interval.

What is temperature?

Temperature is the degree of hotness or coldness of a body. It is measured using a thermometer as described in the set up.

Temperature changes is a result of heat transfer.

The sun is the ultimate source of energy for the earth.

It transfers heat to the earth by radiation.

Under a shade, the tree leaves or shed will cut off the radiation preventing it from reaching the surface. This place will be cool and at a lower temperature than expected.

The thermometer furnished with direct sunlight will have a higher temperature. As the radiation from sun hits the surface, it causes it to warm up and increase in temperature. This will cause the thermometer's temperature to also rise.

learn more:

Thermal energy brainly.com/question/914750

#learnwithBrainly

5 0

3 years ago