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aniked [119]
3 years ago
5

Which of the following stars is likely to be the coldest? Select one: a. The white-colored star b. The orange-colored star c. Th

e blue-colored star d. The red-colored star
Physics
2 answers:
worty [1.4K]3 years ago
6 0
The White colored star is likely to be the coldest
sashaice [31]3 years ago
6 0

Answer:

I would say the white star would be the coolest

Explanation:

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A bicycle starts at 2.5m/s and accelerates along a straight path to a speed of 12.5m/s in a time of 4.5 seconds. What is the bic
zalisa [80]

Answer:

The bicyclist's acceleration is 2.2m/s^2

Explanation:

Given

u = 2.5m/s ---- Initial Velocity

v = 12.5m/s ---- Final Velocity

t = 4.5s ---- Time

Required

Determine the acceleration

This will be solved using the first equation of motion

v = u + at

Substitute values for v, u and a

12.5 = 2.5 + a * 4.5

12.5 = 2.5 + 4.5a

Collect Like Terms

4.5a = 12.5 - 2.5

4.5a = 10.0

Solve for a

a = 10.0/4.5

a = 2.2m/s^2 ---- (approximated)

<em>Hence, the bicyclist's acceleration is 2.2m/s^2</em>

3 0
3 years ago
To pull a nail out of a wood board a carpenter does 1000 J of work. The hammer he uses does 835 J of work. What is the efficienc
saw5 [17]

Answer:

83.5%

Explanation:

7 0
3 years ago
um can someone please help me I'm really stuck on this question and an explanation would be nice thank you
masha68 [24]

Answer: A wavelength is how long ONE wave is. First divide the distance of the whole diagram by the number of waves. you will get 2m. This is the answer.

6 0
2 years ago
A student wants to determine the impulse delivered to the lab cart when it runs into the wall. The student measures the mass of
WINSTONCH [101]

The correct answer to the question is : A) The velocity of the cart after it hits the wall.

EXPLANATION:

Before answering this question, first we have to understand impulse.

Impulse of a body is defined as the change in momentum or the product of force with time.

Mathematically impulse = m ( v- u ).

Here, v is the final momentum and u is the initial momentum.

Hence, we need the velocity of the cart after it hits the wall in order to calculate the impulse of the lab cart.

4 0
3 years ago
Read 2 more answers
Which of the following are scalar quantities?
kirill [66]

Speed, being a scalar quantity, is the rate at which an object covers distance. The average speed is the distance (a scalar quantity) per time ratio. ... Velocity is the rate at which the position changes. The average velocity is the displacement or position change (a vector quantity) per time ratio.

3 0
3 years ago
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