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Andrews [41]
3 years ago
5

A boy and his younger sister are at the zoo on a hot day. They each buy a cold lemonade. The boy buys a large lemonade, and his

sister buys a small. They set their cups on a hot table and wait a while before they start drinking. When they finally begin to drink their lemonade, the girl complains that her drink is no longer cold. However, the brother states that his larger drink is still cold.
What conclusions could the boy and girl accurately draw from their observations? Choose the two that apply.

Question options:

A If there are two different amounts of the same liquid, the temperature is a good way to compare their thermal energies.


B The particles in the warmer cup of lemonade have more kinetic energy than the particles in the colder cup of lemonade.


C Energy from the hot table and warm air is transferred to the cold cups of lemonade.


D The thermal energy of a liquid is the same regardless of
Physics
1 answer:
FromTheMoon [43]3 years ago
7 0

Answer: A and C (i took the test)

Explanation: Hope this helps:)

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A mass of 240 grams oscillates on a horizontal frictionless surface at a frequency of 2.5 Hz and with amplitude of 4.5 cm.
mr_godi [17]

Answer:

(a) The spring constant is 59.23 N/m

(b) The total energy involved in the motion is 0.06 J

Explanation:

Given;

mass, m = 240 g = 0.24 kg

frequency, f = 2.5 Hz

amplitude of the oscillation, A = 4.5 cm = 0.045 m

The  angular speed is calculated as;

ω = 2πf

ω = 2 x π x 2.5

ω = 15.71 rad/s

(a) The spring constant is calculated as;

\omega = \sqrt{\frac{k}{m} } \\\\\omega ^2 = \frac{k}{m} \\\\k = m\omega ^2\\\\where;\\\\k \ is \ the \ spring \ constant\\\\k = (0.24) \times (15.71)^2\\\\k = 59.23 \ N/m

(b) The total energy involved in the motion;

E = ¹/₂kA²

E = (0.5) x (59.23) x (0.045)²

E = 0.06 J

5 0
3 years ago
Q7:<br> A 4 kg toy is lifted off the ground and falls at 3 m/s. What is the toy's energy?
alexandr1967 [171]

Answer:

The toy's energy is 18 J.

Explanation:

We have, a 4 kg toy is lifted off the ground and falls at 3 m/s. It is required to find toy's energy.

The toy will have kinetic energy due to its motion. The energy is given by :

E=\dfrac{1}{2}mv^2\\\\E=\dfrac{1}{2}\times 4\times 3^2\\\\E=18\ J

So, the toy's energy is 18 J.

7 0
3 years ago
In general, if the temperature of a chemical reaction is increased, the reaction rateA. IncreasesB. decreasesC. remains the same
In-s [12.5K]
A. Increases

I would assume this to be the answer because heat is another form of energy. If there is more energy the molecules will become more active. This makes A the most logical answer.
6 0
3 years ago
Suppose you receive $15.00 at the beginning of a week and spend $2.50 each day for lunch. You prepare a graph of the amount you
cestrela7 [59]

Answer:

positive or zero

Explanation:

if you say the amount can be accumulated, then the slope should be positive

if the amount can't be accumulated , the slope should be zero

8 0
3 years ago
Help please physics!!!
Hitman42 [59]

Answer:

I think c is the answer.....

6 0
2 years ago
Read 2 more answers
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