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zimovet [89]
3 years ago
14

Sally made breakfast for the family on Saturday morning. She put some bread in the toaster. When the bread popped up, Sally grab

bed the toast. "Ouch! That's hot!" Sally exclaimed. What was the SOURCE of the heat that made the bread hot?
Physics
2 answers:
Bingel [31]3 years ago
8 0

Answer:

B.) electricity

Explanation:

AleksAgata [21]3 years ago
5 0
The hot wire in the toaster would be the source, or the outlet giving the toaster power. 
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What is the period (in hours) of a satellite circling Mars 100 km above the planet's surface? The mass of Mars is 6.42 × 1023 kg
scZoUnD [109]

To solve this problem it is necessary to apply the concepts related to the Centrifugal Force and the Gravitational Force. Since there is balance on the body these two Forces will be equal, mathematically they can be expressed as

F_c = F_g

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Where,

m = Mass

G =Gravitational Universal Constant

M = Mass of the Planet

r = Distance/Radius

Re-arrange to find the velocity we have,

v^2 = \frac{GM}{r}

At the same time we know that the period is equivalent in terms of the linear velocity to,

T = \frac{2\pi}{\frac{v}{r}}

v = \frac{2\pi r}{T}

If our values are that the radius of mars is 3400 km and the distance above the planet is 100km more, i.e, 3500km we have,

v^2 = \frac{GM}{r}

( \frac{2\pi r}{T})^2 =  \frac{GM}{r}

T = \sqrt{\frac{4\pi^2 r^3}{GM}}

Replacing we have,

T = \sqrt{\frac{4\pi^2 (3500*10^3)^3}{(6.67430*10^{-11})(6.42*10^23)}}

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Therefore the correct answer is C.

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