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Nostrana [21]
2 years ago
7

What happens when you want to move the boat forward? You pull the oars toward yourself.Explain why you do this.

Physics
2 answers:
vampirchik [111]2 years ago
8 0

Answer:

You pull on the oars. By the third law, the oars push back on your hands, but that’s irrelevant to the motion of the boat. The other end of each oar (the blade) pushes against the water. By the third law, the water pushes back on the oars, pushing the boat forward.

kodGreya [7K]2 years ago
5 0
Sheeeeeeeeeeeeeeeeeeeeeeeeeeeeesh
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Answer:

Torque is a measure of the force that can cause an object to rotate about an axis.

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An ultrasound unit is being used to measure a patient's heartbeat by combining the emitted 2.0 MHz signal with the sound waves r
alexandr402 [8]
Hi there, 
for this question we have:
Signal 2.0 MHz = Emitted so we can call it f_e
and we need the Reflected = f_{r}
In this question, we have a source which goes to the heart and a reflected which comes back from the heart and we need the speed of the reflected.
So you should know that the speed of reflected is lower than the source(Emitted). 
we also know: ΔBeat frequency(max) = 560 Hz = f_{b}
so we have: 
f_{e} - f_{r} = f_{b}
so frequency of Reflected is: 
2.0 × 10^6 Hz - 560 Hz = 1.99 × 10^6 Hz = f_{r}
now you know that Lambda = v/f 
so if we find the lambda with our Emitted then we can find v with the Reflected: 
Lambda = 1540(m/s) / 2.0 × 10^6 Hz = 7.7 × 10^-4 m 
=> v_{max} = (lambda)(f_{r} 
=> 7.7 × 10^-4m (1.99 × 10^6Hz) = 1532 m/s 
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This question is solved by two top teachers as fast as they could :))
I hope this is helpful
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3 years ago
How does the law of conservation of energy apply to machines?
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Answer:

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I’m pretty sure it would be 10/20= 0.5m/s2
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