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2 years ago

12

Please help, it's grade 7 science. :)

2 answers:

ANTONII [103]2 years ago

5 0

I just checked the other persons work and it’s correct you should use their work I was just checking if it was right and if I needed to correct anything

xeze [42]2 years ago

4 0

Answer:

The air in the soccer ball in cold weather will decrease slightly in size and it becomes flat. The air in the soccer ball in hot weather will seem flat because the low preasure leads to lower bounce in the ball.

The metal door frame in cold weather contracts and the wood contracts more in the winter. The metal door frame in hot weather thermal blowing can occur on the outer surface of the metal door frame. Hopefully that is what you were looking for have a good day.

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Den pushes a desk 400 cm across the floor. He exerts a force of 10 N for 8 s to move the desk.

stellarik [79]

Answer: The correct option is Option b.

Explanation:

Power is defined as the rate of work done by an object.

Mathematically,

$P=\frac{W}{t}$ .....(1)

And work done is the product of force exerted on the object times the displacement covered by that object.

Mathematically,

$W=F.s$

Putting this value in above equation, we get:

$P=\frac{F.s}{t}$

where,

P = power = ?W

F = Force exerted = 10N

s = Displacement = 400cm = 4m (Conversion factor: 1m = 100 cm)

t = Time taken = 8s

Putting values in above equation, we get

$P=\frac{10\times 4}{8}\\\\P=5W$

Hence, the correct option is Option b.

7 0

3 years ago

Read 2 more answers

a 3.2 kg durian fruit is pushed across the table.If the acceleration of the durian is 3.1 m/s/s to the right,what is the net for

Gala2k [10]

Answer:

<h2>9.92 N</h2>

Explanation:

The force acting on an object given it's mass and acceleration can be found by using the formula

force = mass × acceleration

From the question we have

force = 3.2 × 3.1

We have the final answer as

<h3>9.92 N</h3>

Hope this helps you

4 0

3 years ago

Read 2 more answers

I will give brainliest if right!!!!!!!!!!!

Leya [2.2K]

Answer:

A is a gas becasue it contracts and the containers change.

4 0

3 years ago

If a person pushes a box up a ramp, in which direction will the box exert a force on the person? up the ramp toward the person d

EleoNora [17]

Down the ramp toward the person

4 0

2 years ago

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What is the velocity of the boat if the passenger shoots at an angle 60 with horizontal ? The mass of boat with the passenger is

mixas84 [53]

Answer:

400cos(60) = 200m/s

100(v) = 0.035(200)

v= 0.07m/s

8 0

2 years ago