All categories

3 years ago

Which simple machine is NOT correctly matched with an appropriate task for its use?

1 answer:

6 0

The simple machine that is not correctly matched with its appropriate task is the inclined plane because there is no such big ramp that is as high as 1 storey building, the appropriate task would be Lifting a heavy box and moving it across a room. and for the pulley : <span>Moving a heavy box up to the second floor of a building.</span>

You might be interested in

A bat emits a sound at a frequency of 30.0 kHz as it approaches a wall. The bat detects beats such that the frequency of the ech

Alex

Answer:

The speed of the bat is 5.02 m/s.

Explanation:

Given that,

Frequency = 30.0 kHz

Frequency of echo = 900 Hz

We need to calculate the frequency

Using formula of beat frequency

$f_{b}=f_{1}-f_{2}$

Put the value into the formula

$900=f_{1}-30\times10^{3}$

$f_{1}=900+30000$

$f_{1}=30900\ Hz$

We need to calculate the speed of the bat

Using Doppler equation

$f_{apr}=f\times(\dfrac{v_{sound}+v_{observer}}{v_{s}-v_{source}})$

Put the value into the formula

$30900=30000\times(\dfrac{340+v_{bat}}{340-v_{bat}})$

$\dfrac{30900}{30000}=\dfrac{340+v_{bat}}{340-v_{bat}}$

$1.03=\dfrac{340+v_{bat}}{340-v_{bat}}$

$340\times1.03-340=v_{b}+1.03v_{b}$

$10.2=2.03v_{bat}$

$v_{bat}=\dfrac{10.2}{2.03}$

$v_{bat}=5.02\ m/s$

Hence, The speed of the bat is 5.02 m/s.

6 0

3 years ago

How dense the medium is in the compression part of the wave, and how

ivolga24 [154]

How dense the medium is in the compression part of the wave and how rare the medium is in the rarefaction part of the wave is a measure of the longitudinal wave's amplitude.

4 0

3 years ago

Which of these should be avoided in order to prevent heart diseases and disorders?

White raven [17]

Answer:

drugs and alcohol

Explanation:

All the others will help your body, while drugs and alcohol will only harm it .

4 0

3 years ago

Read 2 more answers

A box has sides of 10 cm, 8.2 cm, and 3.5 cm. What is its volume?

Ksju [112]

The volume would be 287cm³. Multiply all the 3 numbers by each other

4 0

3 years ago

Which statement correctly describes the amount of force applied by the wall as the student conditions to apply a 250-newton forc

Tatiana [17]

B) The wall pulls with a force of 250 N against the force

Explanation:

We can answer this question by using Newton's third law of motion, which states that:

<em>"When an object A exerts a force (called action) on an object B, then object B exerts an equal and opposite force (called reaction) on object A"</em>

In this situation, the student is applying a force of 250 N on the wall. We can identify this force as the action. Therefore, this means (according to Newton's third law) that the wall will also apply a force (the reaction) of equal magnitude (so, 250 N), in the opposite direction to the original force.

Therefore, the correct statement is

B) The wall pulls with a force of 250 N against the force

Learn more about Newton's third law:

brainly.com/question/11411375

#LearnwithBrainly

8 0

3 years ago