PHYSICS MIDDLE SCHOOL

Matter and energy can convert into each other. True False

Answers

Answer 1
Answer:

the answer is True you can convert matter and energy
Answer 2
Answer:

TRUE!!!!!!!

HOPE THIS HELPS YOU!

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A team of eight dogs pulls a sled with waxed wood runners on wet snow (mush!). The dogs have average masses of 19.0 kg, and the loaded sled with its rider has a mass of 210 kg. (a) Calculate the acceleration of the dogs starting from rest if each dog exerts an average force of 185 N backward on the snow. (b) Calculate the force in the coupling between the dogs and the sled.

The mass of a football player who weighs 1250N

Answers



Ah hah !  That depends on where he weighs 1250N, because
weight depends not only on mass but also on the local gravity.
So the same mass can have different weights in different places,
and the same weight can indicate different mass in different places.

       Weight = (mass) x (acceleration of gravity) .

Note:  1250N  is almost exactly  281 pounds.

-- If he weighs 1250N on Mars, then his mass is  336.8 kg.

-- If he weighs 1250N on Earth, then his mass is  127.5 kg.

-- If he weighs 1250N on the Moon, then his mass is  770.2 kg.

How do you know if a wave is a transverse wave or a longitudinal wave?

please help...

Answers

In a longitudinal wave, the motion of the medium is parallel to the direction of the wave .
A transverse wave is a wave in which the motion of the medium is a right angles to the direction of the wave.

Simplified answer:
Longitudinal wave move left and right.( does not goes up and down) Example-sound wave.
Transverse wave move up and down. Example-water wave, light wave

Identify two ways of changing the strength of an electric force

Answers

When you talk about "the strength of an electric force" in middle school, I'm pretty sure you're talking about the force between two electrostatic charges that either pulls them together or pushes them apart.

The strength of that force depends on

-- the product of the amounts of charges on the two charged objects

-- the distance between the centers of their charges.
magnetism and an increase/decrease in temperature

2. A force of 24x10² N exists between a positive charge of 8x10-5C and a positive charge of 3x10C.What distance separates the charges?

Answers

Answer: 94.9 metres

Explanation:

Given that,

Force between the two charges (F) = 24x10² N

Negative charge (q1) = 8x10-5C

Positive charge (q2) = 3x10C

Distance between charges (r) = ?

Apply the formula for

F= (kq1q2) / r²

Recall that k is Coulomb's constant with a value of 9 × 10^9 Nm2C−2

Then,

24x10² N = (9 × 10^9 Nm2C−2 x 8x10-5C x 3x10C) / r²

24x10² N = (2.16 x 10^7) / r²

r² = (2.16 x 10^7 / 24x10² N)

r² = 9000

To get the value of r, find the square root

r = √9000

r = 94.868m (rounded to the nearest tenth as 94.9m)

Thus, a distance of 94.9 metres separates the charges.

Since the early 1990s, geneticists have produced____________ crops that yield fruits and vegetables commonly found in U.S. supermarkets.

Answers

Since the early 1990s, geneticists have produced "genetically modified" crops that yield fruits and vegetables commonly found in U.S. supermarkets. Genetically modified plants (and also applicable to animals) in agriculture are those plants whose DNA are being modified using genetic engineering techniques.

B, Genetically modified.

Draw five protons in the nucleus of the atom

Answers

Protons are positively charged subatomic particles, neutrons are also in the nucleus of an atom but they have no charge ( hope that Helps)
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