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3 years ago

In a sonometer by what change in linear density of wire its velocity becomes double? Keeping tension of wire constant

Physics

1 answer:

faltersainse [42]3 years ago

8 0

Answer:

Explanation:

In a sonometer , expression for speed of wave produced can be given as follows .

v = $\sqrt{\frac{T}{m} }$

v is velocity , T is tension in wire , m is density per unit length .

Here v is inversely proportional to square root of m . So if m becomes m / 4

velocity changes as follows .

velocity = $\sqrt{\frac{T}{\frac{m}{4} } }$

= $\sqrt{\frac{4T}{m} }$

= 2v

velocity becomes two times . Hence to make velocity two times , mass per unit length has to be changed to one fourth value , keeping tension constant .

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One hazard of space travel is debris left by previous missions. There are several thousand objects orbiting Earth that are large

svet-max [94.6K]

Given:

• Mass, m = 0.200 mg

• Speed, v = 3.00 x 10³ m/s

• Time, t = 6.00 x 10^⁻⁸ s.

Let's calculate the force exerted.

Using the inpulse-momentum theroerm, we have:

impulse = change in momemntum

Where:

Impulse = force x time

change in momentum = mass x velocity.

Thus, we have:

$F\times6.00\times10^{-8}=(0.200\times10^{-6})\times(3.00\times10^3)$

Let's solve for the force F:

$\begin{gathered} F=\frac{(0.200\times10^{-6})(3.00\times10^3)}{6.00\times10^{-8}} \\ \\ F=10000N \end{gathered}$

Therefore, the force exterted is 10000 N.

ANSWER:'

10000 N

4 0

1 year ago

Checking Up 1. When a spring scale is used to do work pulling a cart to the top of an incline, where has the energy gone when th

Kobotan [32]

Answer:

1. When a spring scale is used to do work pulling a cart to the top of an incline, the elastic energy stored in the spring is converted into gravitational potential energy, since the top of an incline has a certain height.

2. The roller coaster get its gravitational potential energy from the kinetic energy it carries when it moves with a certain velocity.

3. Truckers use a ramp because it is easier to load a truck with less applied force. Although the work required is the same, without the ramp the force that they should apply is much greater, hence more difficult.

$W = F_1 \times h\\W = F_2 \times d \times \cos(\theta)$

h is greater than (d x cos(Θ)), hence F2 is smaller than F1.

7 0

4 years ago

A 2kg rock is moving at a speed of 6m/s. What constant force is needed to stop the rock in 7 x 10^-4?

dsp73

Explanation:

key to this problem is the impulse-momentum theorem which states that the change in the momentum of an object is equal to the impulse applied into it.

where

is the impulse and

is the change in momentum. Basically, the impulse is the product of force and time duration, that is,

In this problem, the impulse would be the product of the force stopping the rock and

0.7

On the other hand, momentum

is the product of the mass

and velocity

. Therefore, the change in momentum is given by

−

Starting with the impulse-momentum equation, we have

−

Divide both sides by

we get

−

Finally, substitute the values and we get

(

)

(

)

−

(

)

(

)

(

0.7

)

≈

−

Since

then

≈

−

Therefore, using the correct significant figures (in this case, we need one significant figure since 2 kg, 6 m/s and 0.7 s all have one) in the final answer, we would need to have approximately

force to stop the rock in

0.7

Note: The negative sign is referring to the direction of the force opposite of the direction of the velocity

6 0

3 years ago

The unit of energy is a derived quantity. why

Lubov Fominskaja [6]

Answer:

Energy is the tendency to do work.

Explanation:

Energy unit is Joule

1 Joule means 1 kgm²/s²

Energy =Kinertic energy

=1/2 mv²

unit= kgm²/s²

So energy unit is derived unit.

7 0

3 years ago

The following figures show four stages that occur during the formation of a one-solar-mass star. Rank these stages based on thei

Stolb23 [73]

Answer:

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Explanation:

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When the different masses of the mixtures of the gases combines to form a very celestial body then it leads to the composition of each component inside the celestial body to acquire a very flattened form of structure leading to the flattened disk with radiation properties. As the Protostar with jets is formed which means that still the star is in the process of collecting the right amount of materials for its bodily development.
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4 years ago