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kifflom [539]
3 years ago
8

A block is resting on a platform that is rotating at an angular speed of 2.4 rad/s. The coefficient of static friction between t

he block and the platform is 0.83. Determine the smallest distance from the axis at which the block can remain in place wothout skidding as the platform rotates.
Physics
1 answer:
Sloan [31]3 years ago
4 0

Answer:

r = 0m is the Minimum distance from the axis at which the block can remain in place wothout skidding.

Explanation:

From a sum of forces:

Ff = m*a   where Ff = μ * N    and a = \frac{V^2}{r}=\omega^2*r

N - m*g = 0   So, N = m*g.   Replacing everything on the original equation:

\mu*m*g = m*\omega^2*r   (eq2)

Solving for r:

r = \frac{\mu*g}{\omega^2}=1.41m

If we analyze eq2 you can conclude that as r grows, the friction has to grow (assuming that ω is constant), so the smallest distance would be 0 and the greatest 1.41m. Beyond that distance, μ has to be greater than 0.83.

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How does a sound wave transfer energy to your ears ?
horrorfan [7]

Answer:

A. Particles in air move in circles as the wave moves forward.

B. Particles in air move forward but not backward as the wave moves

forward.

C. Particles in air move up and down as the wave moves forward.

✔ D. Particles in air move forward and backward as the wave moves

forward.

Explanation:

The waves transfer energy from the source of the sound, e.g. a drum, to its surroundings. Your ear detects sound waves when vibrating air particles cause your ear drum to vibrate. The bigger the vibrations the louder the sound.

7 0
3 years ago
Read 2 more answers
Explain the differences between a physical and chemical change, and give examples of each.
mrs_skeptik [129]
Chemical change:  a reaction/event where the chemicals/elements present before the change are NOT the same molecules present after the change.
For example, combustion reactions such as the burning of wood or rubbing alcohol are examples of chemical change. The reactants before the combustion of rubbing alcohol are CH3O (rubbing alcohol) and O2 oxygen (oxygen). The molecules present after the combustion reaction are CO2 (carbon dioxide) and H2O (water vapor).

Physical Change: a change in structure or state of a substance but, after the change the material is the same material that we started with. One example would be breaking a glass bottle by dropping it. The glass is now in smaller pieces than when we started, but the glass molecules are still glass molecules.

Hope this helped! Leave any questions you still have for me in the comments below!
4 0
4 years ago
What is an unbalanced force. in your own words but be more detailed.
pogonyaev

Answer:

An unbalanced force is a force that causes an object's state of motion to change. In other words, unbalanced forces are the things that make objects speed up or slow down.

Explanation:

(self-explanatory)

7 0
3 years ago
Find the pressure exerted by a waterbed with dimensions of 2 m x 2 m which is 30 cm thick. (hint: 1000 kg/m3 density of water)
ArbitrLikvidat [17]

Complete question:

Find the pressure exerted by a waterbed with dimensions of 2 m x 2 m which is 30 cm thick. (hint: use 1000 kg/m³ as density of water)

Answer:

The pressure exerted by the waterbed is 2940 N/m²

Explanation:

Given;

Length of waterbed, L = 2 m

Width of waterbed, W = 2 m

Height of waterbed, H = 30 cm = 0.3 m

density of water, ρ = 1000 kg/m³

Hydrostatic pressure derivation:

Pressure = \frac{Force}{Area} = \frac{mg}{L*W} =\frac{(\rho V)g}{L*W}= \frac{(V) \rho g}{L*W} =\frac{(L*W*H)\rho g}{L*W} = \rho gH

The hydrostatic pressure exerted by the waterbed is directly proportional to the height of the waterbed. Thus, the hydrostatic pressure increases with increase in height of the waterbed.

Hydrostatic Pressure exerted by the waterbed:

P = ρgH

P = 1000 x 9.8 x 0.3

P = 2940 N/m²

Therefore, the pressure exerted by the waterbed is 2940 N/m²

4 0
3 years ago
In an oscillating LC circuit, L = 4.24 mH and C = 3.02 μF. At t = 0 the charge on the capacitor is zero and the current is 2.38
Ann [662]

Answer:

a) 2.693*10^-4 C

b) 8.875*10^-5 s

c) 2.96 W

Explanation:

Given that

Inductance of the circuit, L = 4.24 mH

Capacitance of the circuit, C = 3.02 μF

Current in the circuit, I = 2.38 A

See attachment for calculations

7 0
3 years ago
Read 2 more answers
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