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3 years ago

5

A wave created by a certain source travels from medium 1 into another medium 2. It is noticed that its velocity is faster in med

ium 2 than in medium 1

1 answer:

Finger [1]3 years ago

4 0

Do you have a chart or something that goes with it?

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Daniel earned $8.00 per hour at his job. Daniel works 35 hours week. He received a 5% pay increase. How much more money will Dan

polet [3.4K]

Daniel will earn $2.20 more a week because his pay increase will increase his pay from $8 to $8.40

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3 years ago

Mike Powell holds the record for the long jump of 8.95 m, established in 1991. If he left the ground at an angle of 18.8°, what

maksim [4K]

Answer:

<em>12 m/s</em>

Explanation:

<u>Projectile Motion</u>

It's also known as 2D motion because the movement takes place in both axis x and y. The x-axis motion is at a constant speed since in absence of friction, no external force stops or accelerates the object. The y-axis motion is at variable speed, which is changed by the acceleration of gravity that makes the object to reach a maximum height and then go back to ground level.

The maximum horizontal distance reached (also called Range) is given by

$\displaystyle X_m=\frac{V_{o}^2sin2\theta}{g}$

Knowing that $\theta=18.8^o, X_m=8.95\ m$ , we solve for Vo

$\displaystyle V_o=\sqrt{\frac{gX_m}{sin2\theta}}$

$\displaystyle V_o=\sqrt{\frac{9.8\cdot 8.95}{sin(2\cdot 18.8^o)}}=12\ m/s$

Thus, the initial speed of Mike Powell was 12 m/s

7 0

3 years ago

What is the unit for work is called

emmasim [6.3K]

Answer:

The unit you should use for work done and energy is the joule (J) which is indeed the same as the newton metre (N m).

There is another physical quantity which is the product of force and distance and that is torque or moment of a force.

The unit you should use for torque is the newton metre (Nm) and not the joule.

Naming the units of work done and torque differently helps to emphasis the fact that work done and torque refer to two different physical quantities although the definitions of both quantities have the product of force and distance in them.

work done=force→⋅displacement→ and torque→=force→×displacement→

Hope I helped

4 0

3 years ago

What is Newton’s first law

amid [387]

Newton's First Law states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force.

6 0

3 years ago

Read 2 more answers

A ball, which has a mass of 1.25 kg, is thrown straight up from the top of a building 225 meters tall with a velocity of 52.0 m/

Anastasy [175]

First we will find the speed of the ball just before it will hit the floor

so in order to find the speed of the cart we will first use energy conservation

$KE_i + PE_i = KE_f + PE_f$

$\frac{1}{2}mv_i^2 + mgh = \frac{1}{2}mv_f^2 + 0$

$\frac{1}{2}(1.25)(52)^2 + 1.25(9.8)(225) = \frac{1}{2}(1.25)v_f^2$

So by solving above equation we will have

$v_f = 84.3 m/s$

now in order to find the momentum we can use

$P = mv$

$P = 1.25 \times 84.3$

$P = 105.4 kg m/s$

3 0

3 years ago