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4 years ago

11

Can u please help me

2 answers:

Degger [83]4 years ago

6 0

Yes. Organisms do work together to make another level of organization. They work together to make organ systems.

Natasha_Volkova [10]4 years ago

3 0

Yes I’m sure
Can you plz mark me brainliest I really need it to advance a level
Plz
:D

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Describe how earth distance from the sun changes throughout the year when is earth closest to the sun

yaroslaw [1]

The father earth is away from the sun the more cold.
The closer the sun gets the more hot.
When going threw these motions our seasons and days change as the earth moves around the sun while rotating. Hope this helped.

4 0

3 years ago

As you look at the side of the wheel, you can see it spinning clockwise. What are the directions of the angular velocity, and an

lorasvet [3.4K]

Answer:

The direction of angular velocity and angular momentum are perpendicular to the plane of rotation. Using the right hand rule, the direction of both angular velocity and angular momentum is defined as the direction in which the thumb of your right hand points when you curl your fingers in the direction of rotation.

Explanation:

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3 years ago

You push very hard on a heavy desk, trying to move it. You do work on the desk:

frozen [14]

Answer:

(C) Only if it starts moving

Explanation:

We know that work done is given by

$W=F.d=Fdcos\Theta$

So there are two case in which work done is zero

First case is that when force and displacement are perpendicular to each other

And other case is that when there is no displacement

So for work to be done there must have displacement, if there is no displacement then there is no work done

So option (c) will be the correct option

3 0

3 years ago

A ball is thrown upward with a speed of 40 m/s. Approximately how much time goes it take the ball to travel from the release loc

yulyashka [42]

Answer:

(I). The time at highest point 4.0 sec.

(II). It returns to back to its original height in 8.1 sec

Explanation:

Given that,

Velocity $v=40\ m/s$

(I). We need to calculate the time at highest point

Using equation of motion

$v=u+gt$

Where, v = final velocity

u = initial velocity

g = acceleration due to gravity

t = time

Put the value into the formula

$0=40-9.8t$

$-40=-9.8t$

$t=\dfrac{40}{9.8}$

$t=4.0\ sec$

(II). We know that, when the ball to travel from the initial point and reached at initial point then the displacement is zero.

We need to calculate the total time when it returns to back to its original height

Using equation of motion

$s=ut-\dfrac{1}{2}gt^2$

Where, s = displacement

g = acceleration due to gravity

t = time

u = velocity

Put the value in the equation

$0=40t-\dfrac{1}{2}9.8t^2$

$80t-9.8t^2=0$

$t=0, 8.1 sec$

Hence. (I). The time at highest point 4.0 sec.

(II). It returns to back to its original height in 8.1 sec

5 0

3 years ago

What power (in kW) is supplied to the starter motor of a large truck that draws 260 A of current from a 25.5 V battery hookup

joja [24]

Answer:

P = 6.63 kW

Explanation:

Given that,

Current, I = 260 A

Voltage of the battery, V = 25.5 V

We need to find the power supplied to the starter motor. We know that,

P = VI

Put all the values,

P = 25.5 × 260

P = 6630 W

or

P = 6.63 kW

So, the power supplied to the motor is 6.63 kW.

7 0

3 years ago

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