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Citrus2011 [14]

3 years ago

6

Between any object and surface, the coefficient of static friction is _____ the coefficient of kinetic friction.

1 answer:

neonofarm [45]3 years ago

4 0

Greater than.........that,s th answer

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What would be the velocity of a sound wave in the air with a frequency of 260Hz?

enyata [817]

The speed of sound in air doesn't depend on the frequency of the sound. It depends on the temperature, pressure, and humidity of the air. It's usually around <em>340 m/s</em> .

7 0

3 years ago

A 20-pound object is dropped from a 50-foot bridge onto the ground below it. A 50-pound object is dropped from a 100-foot cliff

Anvisha [2.4K]

Answer:

here 20 lb object will hit the ground first

Explanation:

Acceleration of the object while it is dropped in air is given as

$F = mg$

$a = \frac{F}{m}$

$a = g$

so acceleration of the object is independent of the mass of the object

now time to reach the ground is given as

$h = \frac{1}{2}gt^2$

$t = \sqrt{\frac{2h}{g}}$

for 20 pound object

$t_1 = \sqrt{\frac{2(50)}{32}}$

$t_1 = 1.77 s$

for 50 pound object

$t_2 = \sqrt{\frac{2(100)}{32}}$

$t_2 = 2.5 s$

5 0

3 years ago

How are distance and time related when describing motion?

Bingel [31]

an object moves along a straight line, the distance travelled can be represented by a distance-time graph. In a distance-time graph, the gradient of the line is equal to the speed of the object. The greater the gradient (and the steeper the line) the faster the object is moving

3 0

3 years ago

A mass of 15 kg of air in a piston-cylinder device is heated from 25 o C to 77 o C by passing current through a resistance heate

Sophie [7]

Answer:

The electrical energy supplied is 0.233 kWh

Explanation:

Given :

Mass of air $m = 15$ kg

Initial temperature $T _{1} =$ 298 K

Final temperature $T_{2} =$ 350 K

Heat loss $Q _{out} = 60$ kJ

From the first law of thermodynamics,

$\Delta U = W_{in} - W_{out} - Q_{out}$

We know that internal energy is proportional to difference of temperature,

$W_{in} = m (T_{2} - T_{1} ) + 60$

$W_{in} = 15 \times (350-298) + 60 }$

Now we need answer into kWh so ( 1 kWh = 3600 kJ ).

So we need to multiply ( $\frac{1}{3600}$ )

$W_{in} = [15 \times (350-298) + 60 ] \times \frac{1}{3600}$ kWh

$W_{in} = 0.233$ kWh

Therefore, the electrical energy supplied 0.233 kWh

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3 years ago

PLEASE HELP IVE BEEN STUCK ON THIS FOR 3HOURS!

Anika [276]

Answer:

The river bank can expand due to the water breaking apart which can cause sediment to move and change/erode

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4 years ago