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3 years ago

5

Which law states that absolute zero cannot be reached?

1 answer:

Lera25 [3.4K]3 years ago

6 0

Assuming you mean temperature

Answer: The third law of thermodynamics

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Francesca, who likes physics experiments, dangles her watch from a thin piece of string while the jetliner she is in takes off f

Tom [10]

Answer:

$v_f = 82.3 m/s$

Explanation:

When a suspended string makes and angle of 25 degree while aircraft is accelerating on runway then we can use force equations to find the acceleration of the aircraft

So we will have

$T sin\theta = ma$

$T cos\theta = mg$

now from above two equations we have

$a = g tan\theta$

$a = (9.81) tan25$

$a = 4.57 m/s^2$

now if it took 18 s to take off we can have final speed of the aircraft given by

$v_f - v_i = at$

$v_f - 0 = (4.57)(18)$

$v_f = 82.3 m/s$

6 0

3 years ago

Which is a correct example of the principle of conservation of momentum? A) reversing of a car at a dead end B) conversion of ra

Hunter-Best [27]

I think the answer would be D.

3 0

3 years ago

Read 2 more answers

A grapefruit falls from a tree and hits the ground 0.76 s later.

Tomtit [17]

Answer:

2.8 m 7.4 m/s

Explanation:

write all the values then use the equations of motion to find the distance and speed. please see attached photo

7 0

4 years ago

You are traveling in a convertible with the top down. The car is moving at a constant velocity 22.5 m/s, due east along flat gro

Ray Of Light [21]

Answer:

The car moved a distance $x=48.6m$ .

Explanation:

First we need to know: <em>How much time will the tomato spend in the air?</em>

From Kinematics: $v_y(t)=v_0_y+at$

where $v_0_y=10.6\frac{m}{s}$ and $a=-g=-9.8\frac{m}{s^2}$ is gravity's acceleration.

$v_y(t)=v_0_y-gt$

When the tomato touches the car again, $v_y=-v_0_y=-10.6\frac{m}{s}$

Then, we have:

$t=\frac{v_y-v_o_y}{-g}$ ⇒ $t=\frac{v_y-v_o_y}{-g}=2.16s$

Also from Kinematics we have: $x(t)=v_xt$

Which is very simple because we can take initial position 0 and there's no acceleration in the x direction. And $v_x=22.5\frac{m}{s}$

So, taking $t=2.16s$

$x=48.6m$

3 0

3 years ago

I will give you BRAINILIEST!!!!!!!!! AND 15 POINTS

Zigmanuir [339]

Hello.

The best answer would be A.Rift Valley.

It forms when l tectonical plates move away froem each other.

Have a nice day :)

4 0

3 years ago