Answers:
1) I saw a jogger whose velocity was about 3 m/s going straight North.
2) A car passed me at a velocity of almost 45 mles per hour, straight South.
3) I saw a dog chasing a cat. The cat was runing at about 40 km/h, but the dog barely reached 32 km/h, both 30° North of the East.
Explanation:
- <em>Velocity is a vector</em> and so you must report it using the <em>magnitude and </em>the<em> direction</em>.
- Velocity has <em>units</em> of distance (meter, kilometer, miles, among others) divided by units of time (second, minutes, hours, among others).
- The magnitude of velocity is also called <em>speed</em>, and you calculate speed (average speed) as per the formula <em>Speed = distance / time</em>.
The velocities described above have these meanings:
Velocity Magnitude (speed) units direction
3 m/s going North 3 m/s m/s North
45 m.p.h hour, South 45 miles per hour miles/h South.
40 km/h 30° North of East 40 km/h km/h 30° North of East
40 km/h 30° North of East 35 km/h km/h 30° North of East
Remeber, <em>vectors, like velocity, must be describe by its magnitude and direction.</em>
When the surface of the comb rubs on your hair, the comb is electrically charged. When the comb comes close to the paper, the charge on the comb causes charge separation on the paper bits. Since paper is neutral, positive and negative charges are equivalent. The charge on the comb charges the area of the bit of paper nearest the comb to the opposite. Thus, the bits of paper become attracted to the comb.
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Answer:</h3>
12250 J
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Explanation:</h3>
<em>elastic potential energy = 0.5 × spring constant × (extension)2</em>
spring constant = 500
extension = 7cm
7^2=49
0.5 × 500 × 49 = 12250 J or 12.25kJ
Answer:
Rain jackets are coated in durable water-repellant (DWR) finish, a hydrophobic glaze that allows the coats to be breathable, yet waterproof. It lets water vapor—like sweat—out, but keeps rain from getting in. ... Without a DWR, the raincoat is just a coat. So, you'll need to recoat it.
Explanation:
This is according to the web