1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Art [367]
2 years ago
12

a student lift a 25kg mass at vertical distance of 1.6m in a time of 2.0 seconds. a. Find the force needed to lift the mass (in

N ). b. Find the work done by the student (in J). c. Find the power exerted by the student (in W)
Physics
1 answer:
zhannawk [14.2K]2 years ago
5 0

Answer:

a. F = 245 Newton.

b. Workdone = 392 Joules.

c. Power = 196 Watts

Explanation:

Given the following data;

Mass = 25kg

Distance = 1.6m

Time = 2secs

a. To find the force needed to lift the mass (in N );

Force = mass * acceleration

We know that acceleration due to gravity is equal to 9.8

F = 25*9.8

F = 245N

b. To find the work done by the student (in J);

Workdone = force * distance

Workdone = 245 * 1.6

Workdone = 392 Joules.

c. To find the power exerted by the student (in W);

Power = workdone/time

Power = 392/2

Power = 196 Watts.

You might be interested in
2. Neutrons have a ____<br> charge.<br> a. positive<br> b. negative<br> c. neutral
AnnyKZ [126]

Answer:

b. negative

Explanation:

neutrons have a negative charge and protons have a proton has a positive charge

3 0
2 years ago
Read 2 more answers
A wave of wavelength 0.3 m travels 900 m in 3.0 s. Calculate its frequency.
zzz [600]

Answer:

1000 Hz

Explanation:

<em>The frequency would be 1000 Hz.</em>

The frequency, wavelength, and speed of a wave are related by the equation:

<em>v = fλ ..................(1)</em>

where v = speed of the wave, f = frequency of the wave, and λ = wavelength of the wave.

Making f the subject of the formula:

<em>f = v/λ.........................(2)</em>

Also, speed (v) = distance/time.

From the question, distance = 900 m, time = 3.0 s

Hence, v = 900/3.0 = 300 m/s

Substitute v = 300 and λ = 0.3  into equation (2):

f = 300/0.3 = 1000 Hz

6 0
3 years ago
Which has more momentum, a heavy truck moving at 30 miles per hour or a light truck moving at 30 miles per hour?
valentina_108 [34]
A heavy truck moving a 30 mph. It has more mass.
7 0
3 years ago
Read 2 more answers
How do you state a hypothesis
Kaylis [27]

Answer:

If and then for example: If you get at least 6 hours of sleep, you will do better on tests than if you get less sleep.

Explanation:

4 0
3 years ago
According to Newton's third law of motion, which of the following best describes the forces of the tennis racket and the ball?
Effectus [21]

Answer:

OA is the answer

Newton's third law of force states that: for every action (force) in nature there is an equal and opposite reaction. what this means is that if I push on you, you're also pushing me because I have slowed down but now you are falling to the mud.

if you have ever seen newtons balls then you will know what I am talking about, one is moving then it hits the other and it stops moving because now the other one is moving,

I hope this makes sense, if it doesent then go to the net and watch some videos on Newtons third law

hope it helped

8 0
3 years ago
Other questions:
  • 30 points please help a girl out! 
    12·1 answer
  • What is the amount of heat, in calories, given off from a 5 g piece of aluminum when it cools from 80°C to 20°C? The specific he
    15·1 answer
  • What type of hybridization is exhibited by the nitrogen atom in the following substance pairs are present on the nitrogen?: and
    13·1 answer
  • How do the molecules of cold water differ from the molecules of hot water?
    14·2 answers
  • At summer camp, the swimming course runs the length (L) of a small lake. To determine the length of the course, the camp counsel
    15·1 answer
  • You stand on a straight desert road at night and observe a vehicle approaching. This vehicle is equipped with two small headligh
    15·1 answer
  • A ball thrown in the air will never go as far as physics ideally would predict because?
    5·1 answer
  • Ini adalah anjing<br>this is a dog<br><br>​
    11·1 answer
  • 2. A train is traveling at 75 km/hour. How far can it travel in 20 hours?
    5·2 answers
  • An "energy bar" contains 26 ggof carbohydrates.How much energy is this in joules?
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!