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3 years ago

Which is a transverse wave that requires a medium to move?

1 answer:

4 0

<span>the transverse wve that requires a medium to move is : sound waves in order to travel, sound waves need to jumped on between one particle to another, no matter it's liquid, solid , and gases. Which explains why you wont hear a thing in outer space, simply because the sound waves got no particle to jumped into</span>

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a spring is stretched 20 cm by a 30.0 n force. determine the work done in stretching the spring from 0 to 40 cm?

Alekssandra [29.7K]

The work done when a spring is stretched from 0 to 40cm is 4J.

What is work done?

Work done is the magnitude of force multiplied by displacement of an object. It is also the amount of energy transferred to an object when work is done on that.

The work done on the spring to stretch to 40cm is,

F = kx

where F is force, k is force constant.

k = F / x = 10 N / 20 * 10^-2 m = 50 N/m

W = 0.5 * k * (x)^2

where W = work done, k = force constant.

W = 0.5 x 50 x (40 x 10^-2)^2 = 4 J.

Therefore, the work done on the spring when it is stretched to 40cm is 4J.

To learn more about work done click on the given link brainly.com/question/25573309

#SPJ4

3 0

1 year ago

How fast will an object be moving 4 seconds after dropped from rest

9966 [12]

Answer:

Really fast, usually would bounce up and down after it falls

Explanation:

5 0

3 years ago

A straight wire that is 0.60 m long is carrying a current of 2.0 A. It is placed in a uniform magnetic field of strength 0.30 T.

Degger [83]

Answer:

The angle the wire make with respect to the magnetic field is 30°

Explanation:

It is given that,

Length of straight wire, L = 0.6 m

Current carrying by the wire, I = 2 A

Magnetic field, B = 0.3 T

Force experienced by the wire, F = 0.18 N

Let θ be the angle the wire make with respect to the magnetic field. Magnetic force is given by :

$F=ILB\ sin\theta$

$\theta=sin^{-1}(\dfrac{F}{ILB})$

$\theta=sin^{-1}(\dfrac{0.18\ N}{2\ A\times 0.6\times 0.3\ T})$

$\theta=30^{\circ}$

So, the angle the wire make with respect to the magnetic field is 30°. Hence, this is the required solution.

5 0

3 years ago

A 1.5 kg copper block is given an initial speed of3.00m/s on a

ankoles [38]

Answer:

a. 0.01 C

b. dissipated to outside environment

Explanation:

Let the specific heat of copper be 0.3846 kJ/kg-K or 384.6 J/kg-C

(a)The original kinetic energy of the block is:

$E_k = \frac{mv^2}{2} = \frac{1.5*3^2}{2} = \frac{1.5*9}{2} = 6.75 J$

As 85% of this kinetic energy is converted to block internal heat energy, with specific heat we can calculate the rise in temperature:

$E_h = 0.85E_k = 0.85*6.75 = 5.7375 J$

$mc_c\Delta T = 5.7375$

$1.5*384.6\Delta T = 5.7375$

$\Delta T = \frac{5.7375}{1.5*384.6} \approx 0.01^oC$

(b) the remaining 15% energy would probably be dissipated to outside environment as heat energy

6 0

3 years ago

An object falls 210 m in 6.3 s. What was it's initial velocity? Express your answer with the correct number of significant digit

KIM [24]

Answer:

$u = 2.5 \ m/s$

Explanation:

Given data:

Height, $h = 210 \ m$

Time, $t = 6.3 \ s$

Let the initial velocity of the object be <em>u</em>.

From the kinematic equation,

$h = ut + \frac{1}{2}gt^{2}$

$210 = u \times 6.3 + 0.5 \times 9.80 \times (6.3)^{2}$

$\Rightarrow \ u = 2.46 \ m/s$

$u = 2.5 \ m/s$ (rounding to tenth place)

8 0

3 years ago