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Wittaler [7]
3 years ago
14

Q. Tom and Zoe make a string telephone. They use two empty tin cans joined by a piece of string. Tom and Zoe are 5 m apart. Tom

talks quietly into one tin can, and Zoe holds the other tin can to her ear. If they keep the string taut, the sound of Tom's voice travels along the string.
How does the sound travel along the string to Zoe?
Physics
1 answer:
Dahasolnce [82]3 years ago
3 0
Im really not sure i just wanted points ☀︎︎
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The ________________ of a machine is equal to the ratio of the work output to its input.
erastova [34]
Answer: mechanical efficieny.

Efficieny is also expressend as percent. The formula for mechanical efficiency as percent is the ratio work output to wor input times 100.

The ideal mechanical efficiency for a machine would be 1 or 100% which means that all the input work is converted into output work. But this is just an idealization as the friction and other losses of energy make it imposible to reach 100% efficiency in reality, so the mechanical efficiency of real machinces is less than 100% or 1.
5 0
3 years ago
Can a conductor be given limitless charge
k0ka [10]

Answer:

No

Explanation:

You could try to give it enough to fill all valence electrons in all of the atoms in the conductor, but practically this could not be achieved.

5 0
3 years ago
Astronauts measure their mass by measuring the period of oscillation when sitting in a chair connected to a spring. The Body Mas
anzhelika [568]

Answer:

55 kg

Explanation:

spring constant (k) = 600 N/m

mass of chair (Mc) = 12 kg

period of oscillation of chair and man (T) = 2.1 s

what is the mass of the astronaut (Ma) ?

mass of the astronaut (Ma) = total mass (Mt) - mass of chair (Mc)

where

  • total mass (Mt) = \frac{T^{2}}{4π^{2}}k

       taking π as 3.142

       total mass (Mt) = \frac{2.1^{2}}{4 x 3.142^{2}}600

       total mass (Mt) = 67 kg

therefore

mass of astronaut = 67 - 12 = 55 kg

4 0
4 years ago
In order to cool 1 ton of water at 20°C in an insulated tank, a person pours 140 kg of ice at –5°C into the water. The specific
salantis [7]

Answer:

T = 6.31 ^0 C

Explanation:

1 ton = 907.2 kg

so here heat given by water = heat absorbed by the ice

so by energy balance we will have

Q_1 = Q_2

mL + ms\Delta T_1 + ms\Delta T_2 = ms\Delta T_3

so we have

140(2.11)(5) + 140(333.7) + 140(4.18)(T) = 907.2(4.18)(20 - T)

48195 + 585.2 T = 75841.9 - 3792.1 T

T = \frac{27646.92}{4377.3}

T = 6.31 ^0 C

7 0
3 years ago
can cuclin concentration durng mitosis be explained by the fact that the cell divides in two and thus divides the material in th
lana [24]

Answer: No

Can the change in cyclin concentration during mitosis be explained by the fact that the cell divides in two and thus divides the material in the cell into two smaller volumes?

Explanation: The cyclin concentration is not halved but degraded during mitosis.

There is an increase in cyclin concentrations at interphase. These changes are caused by the presence of Cyclin Dependent Kinase (CDK) complexes. CDK being a substrate of cyclin catalyses cyclin, thereby increasing its concentration. During mitosis, cyclins are destroyed, signifying the end of mitosis and cytokinesis.

Without this process, it will be impossible for the cell to exit mitosis.

5 0
3 years ago
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