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
Lemur [1.5K]
3 years ago
15

A dancer lifts his partner above his head with an acceleration of 2.5 m/s squared the dancer. Exerts a force of 200N what is the

mass of the partner
Physics
2 answers:
elena-s [515]3 years ago
4 0
F = ma
F = 200N, a = 2.5m/s^2

200N = (2.5)m
m = 80kg
shepuryov [24]3 years ago
3 0

Answer:

mass = 80 kg

Explanation:

As per Newton's II law we know that

F = ma

here we know that

F = 200 N

also we know that

a = 2.5 m/s^2

so from above formula we have

200 = m(2.5)

m = \frac{200}{2.5}

m = 80 kg

You might be interested in
A cathode ray tube is made of glass with a small amount of some kind of gas in it. It has metal electrodes at each end to pick u
LuckyWell [14K]
Scientists could investigate this idea by making cathode ray tubes out of different materials to see if the ray was the same.
6 0
3 years ago
Read 2 more answers
The distance-time graph for a faster moving object has a smaller slope than the graph for a slower moving object. True or false
allsm [11]
False because faster moving slope would be going up and slower would be going down because its decreasing 
6 0
3 years ago
Read 2 more answers
Decribe an experiment to show that pressure increase with decrease in the area of surface​
topjm [15]

Answer:

for example the studs are made in football player boot because to increase pressure with descrease in area of surface

6 0
3 years ago
A ball is dropped from rest from the top of a building of height h. At the same instant, a second ball is projected vertically u
uranmaximum [27]

Answer:

a) t = \sqrt{\frac{h}{2g}}

b) Ball 1 has a greater speed than ball 2 when they are passing.

c) The height is the same for both balls = 3h/4.

Explanation:

a) We can find the time when the two balls meet by equating the distances as follows:

y = y_{0_{1}} + v_{0_{1}}t - \frac{1}{2}gt^{2}  

Where:

y_{0_{1}}: is the initial height = h

v_{0_{1}}: is the initial speed of ball 1 = 0 (it is dropped from rest)

y = h - \frac{1}{2}gt^{2}     (1)

Now, for ball 2 we have:

y = y_{0_{2}} + v_{0_{2}}t - \frac{1}{2}gt^{2}    

Where:

y_{0_{2}}: is the initial height of ball 2 = 0

y = v_{0_{2}}t - \frac{1}{2}gt^{2}    (2)

By equating equation (1) and (2) we have:

h - \frac{1}{2}gt^{2} = v_{0_{2}}t - \frac{1}{2}gt^{2}

t=\frac{h}{v_{0_{2}}}

Where the initial velocity of the ball 2 is:

v_{f_{2}}^{2} = v_{0_{2}}^{2} - 2gh

Since v_{f_{2}}^{2} = 0 at the maximum height (h):

v_{0_{2}} = \sqrt{2gh}

Hence, the time when they pass each other is:

t = \frac{h}{\sqrt{2gh}} = \sqrt{\frac{h}{2g}}

b) When they are passing the speed of each one is:

For ball 1:

v_{f_{1}} = - gt = -g*\sqrt{\frac{h}{2g}} = - 0.71\sqrt{gh}

The minus sign is because ball 1 is going down.

For ball 2:

v_{f_{2}} = v_{0_{2}} - gt = \sqrt{2gh} - g*\sqrt{\frac{h}{2g}} = (\sqrt{1} - \frac{1}{\sqrt{2}})*\sqrt{gh} = 0.41\sqrt{gh}

Therefore, taking the magnitude of ball 1 we can see that it has a greater speed than ball 2 when they are passing.

c) The height of the ball is:

For ball 1:

y_{1} = h - \frac{1}{2}gt^{2} = h - \frac{1}{2}g(\sqrt{\frac{h}{2g}})^{2} = \frac{3}{4}h

For ball 2:

y_{2} = v_{0_{2}}t - \frac{1}{2}gt^{2} = \sqrt{2gh}*\sqrt{\frac{h}{2g}} - \frac{1}{2}g(\sqrt{\frac{h}{2g}})^{2} = \frac{3}{4}h

Then, when they are passing the height is the same for both = 3h/4.

I hope it helps you!                  

7 0
3 years ago
Explain why an experiment should test only one variable at a time
padilas [110]
We use only one variable at a time to find the accurate result. We want to see how the result of experiment changes everytime with a single variable.
4 0
3 years ago
Other questions:
  • What is a fact and example of an Electron?
    10·1 answer
  • The cycle that moves an important non carbon element, which organisms use to build their cells through Earth's sphere's, is the
    7·1 answer
  • A string is wrapped around a pulley with a radius of 2.0 cm. The pulley is initially at rest. A constant force of 50 N is applie
    7·1 answer
  • A 13.0 kg wheel, essentially a thin hoop with radius 1.80 m, is rotating at 469 rev/min. It must be brought to a stop in 16.0 s.
    8·1 answer
  • What type of fat may help lower the risk of heart disease
    15·1 answer
  • Suppose we consider the system of the three capacitors as a single "equivalent" capacitor. Given the charges of the three indivi
    6·1 answer
  • What is pmolecule and hmolecules
    6·1 answer
  • Which of the following statements is/are true?Check all that apply.a. A conservative force permits a two-way conversion between
    6·1 answer
  • Four different objects are placed on a number line at 0. The chart describes the motion of each object.
    8·1 answer
  • The event in the life of a star that begins its expansion into a giant is Group of answer choices almost all the hydrogen in its
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!