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3 years ago

12

What is the slope if an object comes to a stop then remains at rest?

1 answer:

KIM [24]3 years ago

3 0

It woul be 0 because it is not moving. It is staying at a constant rate.

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3 examples of newtrons 2 law

frozen [14]

Explanation:

1) Kicking a ball.

2) Capture the ball by hand.

3) Push a car.

7 0

3 years ago

When a sound wave travels directly toward a hard wall, the incoming and reflected waves can combine to produce a standing wave.

murzikaleks [220]

Answer:

Explanation:

When standing sound wave is produced in a medium , distance between anti-node and next node is equal to a quarter of a wave length. Node is point of silence where sound intensity is zero or minima.

wave length = velocity / frequency

= 340 / 85

= 4 m

We must move by a distance of 4/4 = 1 m away from wall

to find the first quiet spot.

3 0

3 years ago

At a given moment, a plane passes directly above a radar station at an altitude of 6 km. Let θ be the angle that the line throug

Rom4ik [11]

- 187.237 km/hr fast is θ changing 12 min after the plane passes over the radar station

<u>Explanation:</u>

Let the distance x and angle θ be defined as in the figure below. Then

$\tan \theta=\frac{6}{x}$

Now, differentiate with respect to t, we get

$\sec ^{2} \theta \frac{d \theta}{d t}=-\left(\frac{6}{x^{2}}\right) \frac{d x}{d t}$

Now, calculate the travel distance from radar station to plane after 12min

Distance, $x=800 \times \frac{12}{60}=160$

Substituting ‘x’ value, we get

$\tan \theta=\frac{6}{160}=\frac{3}{80}$

Find the rate of change of theta after 12 min,

$\frac{d \theta}{d t}=-\frac{1}{\sec ^{2} \theta} \times \frac{6}{x^{2}} \times \frac{d x}{d t}$

We know, the formula for,

$\sec ^{2} \theta=1+\tan ^{2} \theta=1+\frac{3^{2}}{80^{2}}$

So, then, $\frac{d x}{d t}=800 \mathrm{km} / \mathrm{hr}(\text { let assume })$

$\frac{d \theta}{d t}=-\frac{1}{\left(1+\frac{3^{2}}{80^{2}}\right)} \times \frac{6}{160^{2}} \times 800$

$=-\frac{1}{\left(1+\frac{3^{2}}{80^{2}}\right)} \times \frac{6}{160^{2}} \times 800$

$=-\frac{1}{1.0014} \times \frac{6}{25600} \times 800$

$=-\frac{4800}{25635.84}=-0.187237 \mathrm{rad} / \mathrm{hr}$

When express the value in km/he, we get, the change in theta as

$=-187.237 \mathrm{km} / \mathrm{hr}$

5 0

3 years ago

If the current of a circuit is 1.5 A, and the power is 24 W. what is the resistor?

Ymorist [56]

Answer:

The resistor has a resistance of 10.667 ohms.

Explanation:

By Ohm's Law, voltage ( $V$ ), in volts, is directly proportional to the current ( $i$ ), in amperes, and by definition of power ( $\dot W$ ), in watts, we have the following formula:

$\dot W = i^{2}\cdot R$ (1)

Where $R$ is the resistance, in ohms.

If we know that $\dot W = 24\,W$ and $i = 1.5\,A$ , then the resistance of the resistor is:

$R = \frac{\dot W}{i^{2}}$

$R = 10.667\,\Omega$

The resistor has a resistance of 10.667 ohms.

3 0

3 years ago

HELP ME ASAP!!!!! This is 7th grade science! Will give brainliest, five starts, and a heart!

stira [4]

Answer:

A- Carries urine to the bladder

B- excretes urine out of the body

C- Stores urine temporarily

D- Produces urine

6 0

2 years ago