All categories

3 years ago

The image is the question

Physics

2 answers:

shusha [124]3 years ago

8 0

If B burns out then the other ones will burn out too

enyata [817]3 years ago

3 0

Answer:

Explanation:

You might be interested in

Describe what is happening to the speed during the period (I). 0s - 10s __________________________________________________ (II).

aleksley [76]

Answer:

- There was a constant acceleration at 0 to 10s

- There was a zero acceleration at 10 to 25s

- There was a constant deceleration at 25 to 30s

Explanation:

See attachment for complete question.

Solving (a): What happens at 0s to 10s

There was a constant acceleration and this is proven below.

At time 0, velocity = 15

At time 10, velocity = 30

This is represented as:

$(t_1,v_1) = (0,15)$

$(t_2,v_2) = (10,30)$

Acceleration (A) is the rate of change of velocity against time.

So:

$A = \frac{v_2 - v_1}{t_2-t_1}$

$A = \frac{30-15}{10 - 0}$

$A = \frac{15}{10}$

$A = 1.5$

Since the acceleration is positive, then it shows a constant acceleration.

Solving (b): What happens at 10s to 25s

There was a zero acceleration and this is because the velocity do not change.

See proof below

At time 10, velocity = 30

At time 25, velocity = 30

This is represented as:

$(t_1,v_1) = (10,30)$

$(t_2,v_2) = (25,30)$

Acceleration (A) is the rate of change of velocity against time.

So:

$A = \frac{v_2 - v_1}{t_2-t_1}$

$A = \frac{30-30}{25 - 10}$

$A = \frac{0}{15}$

$A = 0$

Solving (c): What happens at 25s to 30s

There was a constant deceleration and this is proven below.

At time 25, velocity = 30

At time 30, velocity = 0

This is represented as:

$(t_1,v_1) = (25,30)$

$(t_2,v_2) = (30,0)$

Acceleration (A) is the rate of change of velocity against time.

So:

$A = \frac{v_2 - v_1}{t_2-t_1}$

$A = \frac{0-30}{30-25}$

$A = \frac{-30}{5}$

$A = -6$

Since the acceleration is negative, then it shows a constant deceleration

4 0

3 years ago

A 3.0-kilogram toy dump truck moving with a speed of 4.0 m/s starts up a ramp. How high does the truck roll before it stops?

baherus [9]

Before it reaches the ramp, the toy's kinetic energy is

(1/2) (mass) (speed²)

= (1/2) (3 kg) (16 m²/s²)

= 24 Joules .

On the way up the ramp, its kinetic energy will change to
gravitational potential energy, and it'll stop when it's height
gives it 24 joules of potential energy.

Potential energy = (mass) (gravity) (height)

24 joules = (3 kg) (9.8 m/s²) (height)

Divide each side by 29.4 kg-m/s² (that's the same as 29.4 newtons):

Height = 24 joules / 29.4 newtons

= 0.816 meter higher than the bottom of the ramp.

7 0

3 years ago

What does a mechanical advantage less then one mean? What is gained?

GrogVix [38]

A mechanical advantage less than ' 1 ' means the output force is less than the input
force. But distance is gained ... the load moves farther than the driving force moves.

An example of all this is a big father and his little 4-year-old daughter playing
on the see-saw in the park. He adjusts the board so that he's much closer
to the pivot than she is, and that way, their weights can balance each other.

It's set up so that the mechanical advantage from him to her is less than ' 1 '.
Now, look at what happens when Dad sits down on his end of the see-saw,
and pushes it down with his 180 pounds of force. At the other end, the board
is barely lifting her with a force of just 30 pounds. BUT ... as he sinks down
only 1 foot against his end of the board, her end rises 6 feet off the ground.

7 0

3 years ago

A concave lens can only form a

solmaris [256]

C. A concave lens can only form a virtual image, because they are thinner in the middle and thicker around the edges.

5 0

4 years ago

Some chemical reactions release energy. Others store energy. What important chemical reaction stores energy?

Thepotemich [5.8K]

Chemical energy energy stored in the bonds of chemical compounds. Chemical energy maybe realized during a chemical reaction of in the form of heat

8 0

3 years ago