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3 years ago

When you are travelling downhill on a roller coaster, you experience a light feeling in your stomach. why?

1 answer:

7 0

when you are travelling downhill on a roller coaster, you experience a light felling in your stomach because, at the time of travelling downhill for a very little duration the roller coaster is falling freely on the earth, and for that time period there is no gravity works on you, and you feel the condition of weightlessness that's why you feel light in your stomach.

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Which of the following is the water cycle process where the extra water that plants release is evaporated from their leaves?

ddd [48]

B evaporation since the water is going up

6 0

3 years ago

A car is driving away from a crosswalk. The formula d = t 2 + 2 t expresses the car's distance from the crosswalk in feet, d , i

Ede4ka [16]

Answer:

1) No, the car does not travel at constant speed.

2) V = 9 ft/s

3) No, the car does not travel at constant speed.

4) V = 5.9 ft/s

Explanation:

In order to know if the car is traveling at constant speed we need to derive the given formula. That way we get speed as a function of time:

V(t) = 2*t + 2 Since the speed depends on time, the speed is not constant at any time.

For the average speed we evaluate the formula for t=2 and t=5:

d(2) = 8 ft and d(5) = 35 ft

$V_{2-5}=\frac{d(5)-d(2)}{5-2}=9 ft/s$

Again, for the average speed we evaluate the formula for t=1.8 and t=2.1:

d(1.8) = 6.84 ft and d(2.1) = 8.61 ft

$V_{1.8-2.1}=\frac{d(2.1)-d(1.8)}{2.1-1.8}=5.9 ft/s$

4 0

4 years ago

Waves transfer heat by the process of ______________.<br><br> convection<br><br> radiation

alexandr1967 [171]

Radiation transfers heat by electromagnetic waves

6 0

3 years ago

Read 2 more answers

How many neutrons does element X have if its atomic number is 36 and its mass number is 74?

kari74 [83]

The atomic number Z of an element is the number of protons it contains (and in an atom it is equal to the number of electrons). The mass number M is close to the mass of one mol of the substance but it is defined as the number of protons and neutrons in the nucleus of the atom; there, the main mass of the atom is contained. Hence, N=M-Z=74-36=38(since M counts both protons and neutrons while Z only protons). Thus, it has 38 neutrons.

3 0

4 years ago

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Ben wants to model how the motion of particles changes with temperature. He considers water in an iron pot. Ben draws a model to

Lilit [14]

Answer:

The particles should move faster and have more space between them.

Explanation:

As the molecules heat, they should start to vibrate with the energy. When they vibrate, the space between them increases.

7 0

4 years ago