List five factors that may affect the rate of a chemical reaction

Answers

Answer 1

Answer: 1) temperature
2) pressure
3) concentration
4) surface area
5) the presence of a catalyst

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A baseball of mass 250g, pitched with a speed of 40m/s is caught by the catcher, whose glove moves backward 0.25m while stopping the ball. What was the kinetic energy of the ball before it was caught?

Answers

I don't think we care about the motion of the catcher's glove.

The mass of the ball is 0.25kg and its speed is 40m/s.
So its kinetic energy is . . .

KE = 1/2 (mass) (speed)² =

(0.125 kg) (40m/s)² =

200 kg-m²/s² = 200 joules .

The kinetic energy is =.5mv^2 so the amount the glove moved beforehand is irrelevant and typically this is measured in Kgm/s so 250g is .25kg and v^2 is 40x40 so 1600 lastly 1600x.5x.25 is 200kgm/s :)

a 5 v battery is connected to a resistor which draws a 2 a current. What is the power used by this circuit

Answers

Electrical power = (voltage) x (current)

= (5 volts) x (2 amperes) = 10 watts.

Can someone help please

Answers

Hi there!

We know that:

Potential energy = mgh, where:

m = mass

g = acceleration due to gravity

h = height

We know that ΔPE = mgΔh = 1.47 kJ, so:

1.47kJ = mgΔh

Remember to convert kJ to J for simplicity: (1 kJ = 1000J)

1470J = mgΔh

Rearrange to solve for Δh:

1470/mg = Δh

1470/(60 · 9.8) = 2.5m

Which equation would you need to rearrange to calculate the specific heat of an object

Answers

Heat = specific heat × mass × change in temperature
Specific heat = heat/ (mass×change in temperature)

When the mass of an object increases, the force of gravityincreases.
decreases.
remains the same.
becomes irregular.

Answers

The forces of gravity between two objects depend on the masses
of both objects. So if one mass increases, then the objects will be
drawn together by stronger gravitational force.

Example:
When a person eats a lot of steak and fat and carbohydrates, his
mass increases, and the bathroom scale shows that the gravitational
forces drawing him and the Earth together have increased. We say
that he has "gained weight".

increases

the amount of directly tied to the mass of the object... if the object has less mass, so does the amount of gravity...

An American manufacturer supplied a customer with refrigerators with electrical cords that were one yard long instead of 1 meter long. What was the difference in cord length (cm)?a. 0.856 cmb. 85.6 cmc. 8.56 cmd. 0.00856 cme. 856 cm

Answers

Answer:

C. 8.56cm

Explanation:

Since we are to get the difference of cord length in centimeter, there fore we will have to convert the one yard and one metre length of wires to centimeters.

For 1m length of cord

1m = 100cm

For 1yard length of cord

1yard = 91.44cm

Difference in cord length = 100cm - 91.44cm

= 8.56cm

Answer:

Explanation:

A meter is 8.56 centimeters longer than a yard. Something to keep in mind is that a meter is about 10% longer than a yard.

Hope this helps :)

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