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sammy [17]
3 years ago
7

Which surface produces the least friction when someone walks on it

Physics
1 answer:
Alika [10]3 years ago
6 0

Answer: B Ice

The friction depends on the texture of the surface. A rough surface has more friction. The carpet or wooden surface that we usually walk on have fairly enough friction. We don't slip on sand also much but to walk on ice it requires spokes as you also see while doing ice skating it is very difficult to stand on ice. This is because of low friction on ice floor.

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Distance between the two cars is increasing at the rate of 85 mph. 

A passenger in Car-1 says that he is at rest in his own frame of reference,
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5 0
3 years ago
In 1994, Leroy Burrell of the United States set what was then a new world record for the men’s 100 m run. He ran the 1.00  102
vovikov84 [41]

Answer:

61.33 Kg

Explanation:

From the question given above, the following data were obtained:

Distance = 1×10² m

Time = 9.5 s

Kinetic energy (KE) = 3.40×10³ J

Mass (m) =?

Next, we shall determine the velocity Leroy Burrell. This can be obtained as follow:

Distance = 1×10² m

Time = 9.5 s

Velocity =?

Velocity = Distance / time

Velocity = 1×10² / 9.5

Velocity = 10.53 m/s

Finally, we shall determine the mass of Leroy Burrell. This can be obtained as follow:

Kinetic energy (KE) = 3.40×10³ J

Velocity (v) = 10.53 m/s

Mass (m) =?

KE = ½mv²

3.40×10³ = ½ × m × 10.53²

3.40×10³ = ½ × m × 110.8809

3.40×10³ = m × 55.44045

Divide both side by 55.44045

m = 3.40×10³ / 55.44045

m = 61.33 Kg

Thus, the mass of Leroy Burrell is 61.33 Kg

5 0
3 years ago
A quantum well is a region of semiconductor or metal film that confines particles to a small region, resulting in quantized ener
murzikaleks [220]

Answer:

226.2 m/sec

Explanation:

We have given \Delta x=510nm=510\times 106{-9}m

The plank's constant h=6.67\times 10^{-34}

Mass of electron m=9.11\times 10^{-31}kg

Now according to Heisenberg uncertainty principle \Delta v\geq \frac{h}{2\pi m\Delta x}

So \Delta v\geq \frac{6.6\times 10^{-34}}{2\times 3.14\times 9.11\times 10^{-31}\times 510\times 10^{-9}}=226.2m/sec  

5 0
3 years ago
Can the resistors in an "unbalanced" Wheatstone bridge circuit be treated as a combination of series and/or parallel resistors?
OlgaM077 [116]

Answer:

Explanation:

The resistors in a unbalanced wheat stone bridge cannot be treated as a combination of series and parallel combination of resistors.

In case of balanced wheat stone bridge, the resistors can be treated as the combination of series and parallel combination.

Here, In the balanced wheat stone bridge

R1 and R2 be in series and Ra and Rx is series and then their combination is in parallel combination.

4 0
3 years ago
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