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Studentka2010 [4]
3 years ago
9

How does friction affect speed?

Physics
1 answer:
weeeeeb [17]3 years ago
7 0

Answer:

Friction is a force tends to oppose relative motion between bodies when they are in direct contact. Remember this friction does not oppose motion, it opposes relative motion.

Explanation:

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What units is the Metric System of Measurement based on?
Alex787 [66]

Answer:

metre for length and the kilogram for Mass

3 0
2 years ago
Do Earth's continents gain or lose water, considering evaporation and precipitation together? How much ? Plz help :)) Thx
ratelena [41]

Answer:

<em>The amount of water in circulation is the same</em>

Explanation:

The water cycle is the pathway in which water moves from the atmosphere to the earth and back to atmosphere ones again.

During the sunny period, the temperature of the earth is heated up, water evaporates to the atmosphere as water vapour. The water vapour gathers as cloud and comes back to the earth as rain, which enters our rivers and stream. Thereby maintaining a continuous cycle.

With the water cycle, the movement of water via precipitation and evaporation is the same on earth.

5 0
3 years ago
A student wish to measure the gravitational acceleration g. She does it by releasing a small lead ball from rest and measures th
Goryan [66]

Answer:

(9.64 +- 0.86) m/s^2

Explanation:

The generic motion equation for constant acceleration is

x = X0 + v0 * t + \frac{1}{2}*a * t^2

Where

X0: initial position

v0: initial speed

a: acceleration

t: time

If the object has an initial speed of zero, and the frame of reference is set conveniently so that the object initial position is zero, the equation simplifies to:

x = \frac{1}{2}*a * t^2

And the acceleration can be obtained as:

a = 2*\frac{x}{t^2}

Where x is the distance fallen and a = g.

So, with the data x = (100.0 +- 0.03) mm and t = (144 +- 3) ms we can calculate

g = 2*\frac{100}{144^2} = 9.64e-3 \frac{mm}{ms^2} = 9.64 \frac{m}{s^2}

For the uncertainty we have to calculate the relative uncertainties first

For the distance (100 * 0.3)/100 = 0.3%

For the time (100 * 3)/144 = 2.08%

For multiplications or divisions the relative uncertainties are added

0.3% + 2.08% + 2.08% = 4.46%

We convert this into absolute uncertainty:

(9.64e-3 * 4.46)/100 = 0.00043 mm/(ms^2)

Finally, this is multiplied by a constant scalar, so:

2 * 0.00043 mm/(ms^2) = 0.00086 mm/(ms^2)

We convert the units

0.86 m/(s^2)

And the measurement is (9.64 +- 0.86) m/s^2

A better method is putting the ball in a ramp instead of a free fall, that way the fall is longer and the effect of time measuring uncertainty is reduced.

5 0
2 years ago
Problem 3 A person is standing in a room. Air temperature is 20 C. Assuming that his surface temperature is 30 C, calculate the
PilotLPTM [1.2K]

Answer:

the heat flux between the person and the room = 6.0036 x 10 17 w/m2

Explanation:

The appropriate formular for the steffan boltzmann constant is used as it relates to the heat flux and the steps is as shown in the attachment.

6 0
3 years ago
Complete each sentence by putting a tick in the box next to the correct answer.
Scorpion4ik [409]

c unreliable energy source

8 0
3 years ago
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