PHYSICS MIDDLE SCHOOL

Help. “What is the particles acceleration at t=3.0 s?”

Answers

Answer 1

Answer:

Answer:

-2 m/s²

Explanation:

Acceleration is the rate of change of velocity:

a = Δv / Δt

In other words, it's the slope of the line on a velocity-time graph. The line at t=3 also goes through the points (2, 4) and (4, 0).

a = (4 m/s − 0 m/s) / (2 s − 4 s)

a = -2 m/s²

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student built a simple heat engine that could lift masses. If the heat engine takes in 300 J of heat and loses 50 J to the environment, how much height will it lift a 1.5 kg mass?
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17. Which of the following is the closest weight in newtons of a 7.0-kilogrambowling ball? *A. 7.0 newtonsB. 70 newtonsC. 700 newtonsd. 7000 newtons

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.

Two spheres exert a gravitational attraction on each other. Which of the following changes to this system would reduce the gravitational attraction by one half?

Answers

- Decreasing one of the masses to 1/2 of its original value

- Increasing the distance by a factor of $√(2)$

Explanation:

There are no options provided, however we can still answer the question.

In fact, the magnitude of the gravitational force between two objects is given by the equation:

$F=G(m_1 m_2)/(r^2)$

where

$G=6.67\cdot 10^(-11) m^3 kg^(-1)s^(-2)$ is the gravitational constant

m1, m2 are the masses of the two objects

r is the separation between them

We notice that:

The gravitational force is proportional to the product between the masses
The gravitational force is inversely proportional to the square of the distance between the masses

Therefore, in order to reduce the gravitational attraction by one half, we can do one of the following changes:

- Decreasing one of the masses to 1/2 of its original value: for example, if $m_1'=(1)/(2)m_1$ , the gravitational force becomes

$F'=G(m_1' m_2)/(r^2)=G((1)/(2)m_1m_2)/(r^2)=(1)/(2)(G(m_1m_2)/(r^2))=(1)/(2)F$

- Increasing the distance by a factor of $√(2)$ : in fact, if $r'=√(2)r$ , the gravitational force becomes

$F'=G(m_1 m_2)/(r'^2)=G(m_1m_2)/((√(2)r)^2)=(1)/(2)(G(m_1m_2)/(r^2))=(1)/(2)F$

Learn more about gravitational force:

brainly.com/question/1724648

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#LearnwithBrainly

One Newton is expressed in ?

Answers

Answer:

It is the SI unit of force.

Explanation:

The rate of change of momentum in the body is directly proportional to the force applied on the body. It is the second law of motion.

The mathematical form of Newton's second law is

F = m x a

where, m is the mass and a be the acceleration.

If a body of mass 1 kilogram having an acceleration of 1 m/s^2, it means the force applied on the body is 1 newton.

The newton is the SI unit for force; it is equal to the amount of net force required to accelerate a mass of one kilogram at a rate of one meter per second squared.

· A hot, just-minted copper coin is placed in 101 g of water to cool. The watertemperature changes by 8.39°C, and the temperature of the coin changes
by 68.0°C. What is the mass of the coin?
Please helppp!!!

Answers

The mass of the copper coin placed in 101g of water is 135.3g.

COLORIMETER:

The mass of the copper coin can be calculated using the following expression:

Since; Q = mc∆T

Where;

Q = heat absorbed or released
m = mass of substance
c = specific heat capacity of substance
∆T = change in temperature
mc∆T (water) = mc∆T (copper)

According to the question;

COPPER METAL:

m = ?
c = 0.385 J/g°C
∆T = 68°C

WATER:

m = 101g

c = 4.18 J/g°C

∆T = 8.39°C

⇒ 101 × 4.18 × 8.39 = (0.385 × m × 68)

⇒ 3542.09 = 26.18m

⇒ m = 3542.09 ÷ 26.18

⇒ m = 135.3g

Therefore, the mass of the copper coin placed in 101g of water is 135.3g.

Learn more about specific heat at: brainly.com/question/13439286

#SPJ2

Answer:

135g

Explanation:

What causes earthquakes and volcanic erruptions

Answers

Tectonic plates under the ground ,either go on top of each other or crash.

The tectonic plates as they have energy that causes volcanic explosions and earthquakes. SCIENCE!!!!!!!

How does compression (the force) work? Not tension and compression. Just compression.

Answers

What allows an arch bridge to span greater distances than a beam bridge, or a suspension bridge to stretch over a distance seven times that of an arch bridge? The answer lies in how each bridge type deals with the important forces of compression and tension.

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Which material will refract light the least? n = 1.72 n = 2.34 n = 1.58 n = 1.92 I think the answer is n = 1.58 but I need to know why a low index of refraction makes light move slower because I thought a low n would make light move faster in the medium.

Which of the following best describes gravitational force?An attraction between two objects that have massAn attraction between two objects due to their electronsThe force that keeps atoms and molecules bound togetherThe force that keeps objects from moving when they are at rest