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McMaster University

04:27

Kai C.

(I) A 110-kg tackler moving at 2.5 ms meets head-on (and holds on to) an 82-kg halfback moving at 5.0 m/s. What will be their mutual speed immediately after the collision?

01:24

(I) What is the magnitude of the momentum of a 28-g sparrow flying with a speed of 8.4 m/s?

05:29

Kathleen T.

(I) What is the weight of a 68-kg astronaut ($a$) on Earth, ($b$) on the Moon ($g =1.7 m/s^2$) ($c$) on Mars ($g = 3.7 \,m/s^2$) ($d$) in outer space traveling with constant velocity?

07:43

(II) A person has a reasonable chance of surviving an automobile crash if the deceleration is no more than 30 $g$'s. Calculate the force on a 65-kg person accelerating at this rate.What distance is traveled if brought to rest at this rate from 95 km/h?

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Welcome to our second example video. Looking at the Doppler effect, this video will consider ourselves to be on a skateboard rolling away from your friend who is calling out to you. Okay, so they're making noise. You're moving this way. So in this case, the speed of the observer is going to be We'll give ourselves a speed of 4 m per second, your friends calling out to you, and we'll say that their frequency of their voice is equal to 480 hertz. Now, I should mention, as we talk about sound here, that you don't speak at a single frequency. You actually speak at many different frequencies at the same time. Um, but we're going to consider the loudest frequency that you're talking at because that will be the one that is most hurt. Okay, so we have frequency is 480 hertz. We want to know what is the frequency of you if the speed of the source zero in this case, well again, we resort to our equation. F not is equal to F s times V plus or minus B not divided by the speed of sound plus or minus v source because we have the sources. Zero. This part is zero of here. We see that we're moving away. And so what the effect of this is is that we're increasing the time in between us getting hit by a crest in the waves. So what that means is we are increasing the lambda and we want to decrease the frequency, so we need f not less than f s. Okay, In order for that to happen, we want our numerator to be smaller than our denominator means we need VVS minus V not divided by V s again, where V s is the speed of sound at room temperature approximately 343 meters per second. So you can type that in and find out what the frequency is that you hear your friends speaking at

Superposition

Thermal Properties of Matter

The First Law of Thermodynamics

Kinetic Theory Of Gases

The Second Law of Thermodynamics

02:35

04:09