What does the slope of the trend line represents on a x-y graph

Why does heat cause a substance to expand?

natita [175]

Middle school? lol but, the third one.

5 0

3 years ago

Question: 23 of 66: If you increase the frequency of a sound wave four times, what will happen to its speed?Select one of the op

zysi [14]

If you increase the frequency of a sound wave four times, t<span>he speed will increase four times. The correct option among all the options that are given in the question is the first option or option "A". This also shows the frequency and speed of the waves are directly proportional to each other. I hope it helps you.</span>

4 0

3 years ago

Read 2 more answers

If Light is travels from air into pure water with an incident angle of 30°. What is the angle of refraction?

Orlov [11]

Explanation:

For air, n1 = 1.00003; for water, n2 = 1.3330

Given: θ2 = 30 degrees, then

θ1 = arcsin [(n2/n1) sin θ2]

= arcsin [(1.3330/1.0003) sin (40)]

= 58.93 degrees

Note that since, in this example, light is traveling from a medium of higher density (water; n2 = 1.3330) to a medium of lower density (air; n1 = 1.0003), then n2 > n1, and the angle of refraction (θ1) is larger than the angle of incidence (θ2), thus the light bends away from the normal (in this example, the vertical) as it leaves the water and enters the air.

7 0

3 years ago

Two solenoids stand side-by-side. Solenoid B differs from solenoid A in three respects. Its total current is 2 times as great, i

vazorg [7]

Answer:

5. Solenoid B’s magnetic field is 2.7 times greater than solenoid A's magnetic field.

Explanation:

The magnetic field produced by a solenoid depends on number of coils, the length of the solenoid and the amount of current flowing through the coil.

$B=\frac{\mu \times N \times I}{L}$

Current in solenoid B is 2 times greater than the current in solenoid A.

$I_B=2I_A$

Number of coils in B is 4 times greater than coils in A

$N_B=4N_A$

Length of the solenoid B is 3 times greater than solenoid A

$L_B=3L_A$

$B_B=\frac{2\times 4}{3} B_A=2.7 B_A$

Thus, solenoid B's magnetic field is 2.7 times greater than magnetic field of solenoid A.

5 0

3 years ago

A hovering mosquito is hit by a raindrop that is 50 times as massive and falling at 8.9 m/s , a typical raindrop speed. How fast

Ivahew [28]

Answer:

v = 8.72 m/s

Explanation:

To find the speed of the raindrop joint to the mosquito, you take into account the momentum conservation law for an inelastic collision. Before the collision the total momentum of raindrop and mosquito must be equal to the total momentum of both raindrop and mosquito after the collision.

$m_1v_1+m_2v_2=(m_1+m_2)v$ (1)

v1: speed of the mosquito before the collision= 0 m/s (it is at rest)

v2: speed of the raindrop before the collision = 8.9 m/s

m1: mass of the mosquito

m2: mass of the raindrop = 50m1 (50 time more massive that the mosquito)

v: speed of both raindrop and mosquito after the collision

You solve the equation (1) for v and replace the values of the rest of the parameters:

$v=\frac{m_1v_1+m_2v_2}{m_1+m_2}=\frac{m_1v_1+50m_1v_2}{m_1+50m_1}\\\\v=\frac{0m/s+50(8.9m/s)}{51}=8.72\frac{m}{s}$

hence, after the inelastic collision the speed of the raindrop andmosquito is 8.72 m/s

3 0

3 years ago