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yawa3891 [41]
3 years ago
5

D 2. Which of the following is an example of a specific goal?

Physics
1 answer:
sammy [17]3 years ago
5 0

I want to improve my speed

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A boat sends an ultrasound signal of frequency 30 kHz, and receives the signal after 6 s. If the speed of sound in water is 1500
natka813 [3]

Answer:

4500

Explanation:

hey there!

first we convert the khz to hz=30000hz

we use the formula 2d=distance×time

2d=1500×6

d=9000/2=4500

i think this is the right answer....

hope this helps u :)

3 0
3 years ago
If we add 50 Joules of thermal energy to a heat engine, and that heat engine does 30 Joules of work, how much thermal energy is
Natalka [10]

Answer:

The correct answer should be

A. 20 Joules

Explanation:

I'm taking the K12 Unit Test: Energy - Part 1 right now

7 0
3 years ago
he magnetic coils of a tokamak fusion reactor are in the shape of a toroid having an inner radius of 0.700 m and an outer radius
RideAnS [48]

Answer:

B = 4.323 T

Explanation:

We are given;

Inner radius; r_i = 0.7 m

Number of turns; N = 890 turns

Current; I = 17 KA = 17000 A

Formula for the magnetic field inside the toroid along the inner radius is given by;

B = (μ_o × N × I)/(2πr)

μ_o is vacuum of permeability with a constant value of 4π × 10^(-7) H/m

Plugging in the relevant values, we have;

B = (4π × 10^(-7) × 890 × 17000)/(2 × π × 0.7)

B = (2 × 10^(-7) × 890 × 17000)/(0.7)

B = 4.323 T

4 0
3 years ago
Your pet hamster sits on a record player whose angular speed is constant. If he moves to a point twice as far from the center, t
baherus [9]

Answer:

doubles

Explanation:

The relationship between angular speed and linear speed in case of a circular motion is the following:

v=\omega r

where

v is the linear speed

\omega is the angular speed

r is the distance from the centre of the circular path

In this proble, the pet hamster moves to a point twice as far from the center; this means that its distance from the centre, r', is doubled:

r'=2r

While the angular speed \omega remains the same. Therefore, the new linear speed is

v'=\omega r' = \omega (2r)=2 \omega r=2v

So, the correct answer is

the linear speed doubles

6 0
4 years ago
What type of change occurs when ice absorbs energy and melts?
anygoal [31]
The answer is C.endothermic change.

♡♡Hope I helped!!! :)♡♡
3 0
3 years ago
Read 2 more answers
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