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2 years ago

14

g An electric hot plate raises its own internal energy and the internal energy of a cup of water by 9000J, and there is at the s

ame time 2700J transferred to the cooler air. How much energy was transferred to the hot plate in the form of electricity

1 answer:

DochEvi [55]2 years ago

3 0

Answer:

11700j

Explanation:

add the two because the plate has to maintain the temp.

2700+9000=11700

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Light does bend in a gravitational field. Why is this bending not taken into consideration by surveyors who use laser beams as s

Goshia [24]

Answer:

Because the effect is not big enough to be noticeable.

Explanation:

The light is bent by gravitational fields, but the bend is not that big unless we are talking about objects with a massive amount of mass. To be noticed the bent, you need to stay far away from the object that causes the blend and the object also needs to be far away from the source of the light. For example, you can observe the blend in the light of a far-away star when the light travels close to the sun to reach earth, and the deflection will be around 1.75 arc-seconds. The deflection occurs also with light beams on the earth but the effect is too small to be taken into consideration.

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2 years ago

Suppose a car is traveling at 18.6 m/s, and the driver sees a traffic light turn red. After 0.500 s has elapsed (the reaction ti

beks73 [17]

Answer:

s = 52.545 m

Explanation:

First, we calculate the distance covered during the 0.5 s when the driver notices the light and applies the brake.

$s_{1} = vt\\$

where,

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v = speed = 18.6 m/s

t = time = 0.5 s

Therefore,

$s_{1} = (18.6\ m/s)(0.5\ s)\\s_{1} = 9.3\ m\\$

Now, we calculate the distance for the car to stop after the application of brakes. For that we use 3rd equation of motion:

$2as_{2} = V_{f}^{2} - V_{i}^{2}\\\\$

where,

s₂ = distance covered after applying brake = ?

a = deceleration = - 4 m/s²

Vf = final speed = 0 m/s

Vi = initial speed = 18.6 m/s

Therefore,

$2(- 4\ m/s^{2})s_{2} = (0\ m/s)^{2} - (18.6\ m/s)^{2}\\\\s_{2} = \frac{(18.6\ m/s)^{2})}{8\ m/s^{2}}\\\\s_{2} = 43.245\ m$

So the total distance covered by the car before stopping is:

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<u>s = 52.545 m</u>

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3 years ago

A student performs an activity using a sheet of paper, a magnet, and a steel ball. The image shows the setup. The student observ

son4ous [18]

Answer:b

Explanation:

6 0

3 years ago

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Why car speed is not considered as car velocity?

grigory [225]

Answer:

Cause its scalar quantity

Explanation:

since speed does not take directions into consideration, it is considered to be a scalar quantity. On the other hand, the velocity of an object does not take into account direction, thus making it a vector quantity.

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3 years ago

According to Ohm’s law, which combination of units is the same as the unit for resistance? volt ÷ ampere ampere × volt volt + am

Maksim231197 [3]

Answer:

volt ÷ ampere

Explanation:

The mathematical form of Ohms law is given by :

V = IR

Where V is voltage

I is current

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The unit of voltage is volt and that of current is ampere

Unit of resistance :

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So, volt ÷ ampere is the same as the unit of resistance. Hence, the correct option is (a).

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2 years ago

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