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3 years ago

Why does a cake bake in a microwave oven, but the baking dish does not get hot?

1 answer:

6 0

1.THATS kinda more observed question..
well I think microwave the material is baked by passing microwave radiations. which then makes the cake fluffy. which is not like normal heating apparatus, I believe the baking dish do have certain rise in temperature,but not more as the waves are conducted it is not like normal heating which will be then conducted..
2. also it depends on the material too I mean plastic will melt but glass won't.. one has to experimentally observe and perform in order to have a full understanding of this question

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The longer the lever, the greater the

Simora [160]

Answer: The longer the lever, the greater the force on the load will be.

Explanation:

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3 years ago

How to do this problem

marusya05 [52]

The answer I'm pretty sure is 3

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3 years ago

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A 70.0-kilogram man is walking at a speed if 2.0 m/s. What is the kinetic energy?

Paraphin [41]

Answer:

140 J

Explanation:

From the the question, the mass of the man =70.0 kg and the speed at which the man is walking =2.0 m/s.

$K.E = \frac{1}{2}m {v}^{2}$

where K.E = the kinetic energy, m=mass and v= speed.

By substitution,

$K.E = \frac{1}{2} \times 70 \times {2}^{2}$

$\implies \: K.E = \frac{280}{2}$

$\implies K.E =140$

Hence the kinetic energy of the man is 140J

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2 years ago

If a black hole itself emits no radiation, what evidence do astronomers and physicists today have that the theory of black holes

AleksandrR [38]

Answer:

Einstein's general theory of relativity is the theory behind black holes has been tested with a wide range of experiments of which all confirm the predictions the theory makes. We cannot see black holes phenomena inside the event horizon, we do observe things outside this limit.

Black holes in binary star systems leave signs of their presence on neighboring star thats detected and the signs include X-ray emissions, accretion disks, and large orbit perturbations.

this is the evidence that astronomers and physicists have to show that the theory about black holes is correct.

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3 years ago

A spaceship is travelling at 20,000.0 m/s. After 5.0 seconds, the rocket thrusters are turned on. At the 55.0 second mark, the s

tankabanditka [31]

Answer:

$80 m/s^2$

Explanation:

The acceleration of an object is given by:

$a=\frac{v-u}{t}$

where

v is the final velocity

u is the initial velocity

t is the time interval it takes for the velocity to change from u to v

For the rocket in this problem,

u = 20,000 m/s

v = 24,000 m/s

t = 55.0 - 5.0 = 50.0 s

Substituting,

$a=\frac{24000-20000}{50}=80 m/s^2$

7 0

3 years ago