PHYSICS MIDDLE SCHOOL

Which of the following objects would transfer heat by convection?A. oxygen
B. ice cube

Answers

Answer 1
Answer:

Answer:

oxygen

Explanation:

I just did the assignment and that was the right answer.

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A helicopter’s speed increases from 30 m/s to 40 m/s in 5 seconds. What is the acceleration of this helicopter? m/s2

Answers

Answer:

The acceleration of this helicopter is 2 m/s2

Explanation:

In this question the velocity changes from 30 m/sto 40 m/s in 5 seconds.

Initial velocity u= 30m/s

Final velocity u= 40m/s

Time t= 5s

Acceleration is defined as the rate of change of velocity. It is given by the equation

a= (v-u)/(t)

      =(40-30)/(5)

= (10)/(5)  

= 2 m/s2

All moving bodies aren’t necessarily accelerated. To be identified as accelerating, a body should have its velocity changing. Thus a body in uniform motion is not accelerating since its velocity is constant.

Answer:

A helicopter’s speed increases from 30 m/s to 40 m/s in 5 seconds.

What is the acceleration of this helicopter?

2

m/s2

Explanation:

Correct on egde

A block of mass m1=3.7kg on a smooth inclined plane of angle 30 is connected by a cord over a small frictionless pulley to a second block of mass m2=2.3kg hanging vertically. Calculate the acceleration of each block

Answers

consider the forces on mass m₁ on the incline plane :

parallel to incline , force equation is given as

T - m₁ g Sin30 = m₁ a

T = m₁ g Sin30 + m₁ a                                       eq-1

consider the force on mass m₂ on the incline plane :

m₂ g - T = m₂ a  

T = m₂ g - m₂ a                                                  eq-2

Using eq-1  and eq-2

m₂ g - m₂ a = m₁ g Sin30 + m₁ a

inserting the values

(2.3 x 9.8) - 2.3 a = (3.7 x 9.8) Sin30 + 3.7 a

a = 0.74 m/s²

Confused about c). Would it be Q-R because the velocity isn’t increasing or all of them because they are all linear lines?

The question says interval and not interval(s) so that’s why it’s making me think it may be the latter.

Answers

Answer:

Q-R is correct

Explanation:

A constant velocity means a velocity that is not changing.

The velocity is increasing (changing) in O-P, P-Q and R-S.

Since the Q-R segment is a horizontal line, the velocity stays the same. If you imagine the graph's velocity y-axis is labelled, it might be easier to think about.

Answer:

The velocity is constant only in the Q-R interval.

Explanation:

The graph shows the velocity over time. In the Q-R interval the velocity is equal all over the interval, that is, it is constant. In the other intervals, the velocity increase with some rate, so it is not constant.

There are three different types of electrochemical cells.

True or False​

Answers

Answer:

The answer to this question is False

Answer:

false

Explanation:

How must of the roller coaster's kinetic and/or potential energy is in each of the points. For each point, pick one option. (Sorry for the report, I found a mistake in my question and could not edit.)Point A:
a. 1/2 Potential Energy, 1/2 Kinetic Energy
b. 1/2 Potential Energy, 0 Kinetic
c. 100 Potential Energy

Point B:
a. 1/4 Potential, 3/4 Kinetic
b. 100 Kinetic, 0 Potential
b. 1/2 Potential, 1/2 Kinetic

Point C:
a. 1/2 Potential, 1/2 Kinetic
b. 3/4 Potential, 1/4 Kinetic
c. 100 Potential, 0 Kinetic

Answers

Answer

  1. Point A-
  2. Point B-
  3. Point C- 100 Potential, 0 Kinetic

What are examples of newton's 3 law

Answers

Newton's First Law Example: Driving a car and hitting something like a tree, the car will stop instantly but you'll keep moving forward. Cars have airbags because of this.

Newton's Second Law Example: It's easier to push a box without anything inside it than a box full of stuff because the box that is full has more mass than the empty one.

Newton's Third Law Example: When air rushes out of a balloon, the opposite reaction is that the balloon will fly around the room.
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