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
rodikova [14]
3 years ago
9

If a 75-kg skater starts his skate at 8.0m, at his lowest point (height = 0), what is

Physics
1 answer:
Tanya [424]3 years ago
6 0
Mgh= 1/2 m v^2
gh= 1/2 v^2 9.8 * 8=  1/2 v^2
solve for v
V = sqrt(2gH)where H = 8 m.
You might be interested in
A wheel rotates about a fixed axis with a constant angular acceleration of 3.3 rad/s2. The diameter of the wheel is 21 cm. What
AleksandrR [38]

Answer:

The the linear speed (in m/s) of a point on the rim of this wheel at an instant=0.418 m/s

Explanation:

We are given that

Angular acceleration, \alpha=3.3 rad/s^2

Diameter of the wheel, d=21 cm

Radius of wheel, r=\frac{d}{2}=\frac{21}{2} cm

Radius of wheel, r=\frac{21\times 10^{-2}}{2} m

1m=100 cm

Magnitude of total linear acceleration, a=1.7 m/s^2

We have to find the linear speed  of a  at an instant when that point has a total linear acceleration with a magnitude of 1.7 m/s2.

Tangential acceleration,a_t=\alpha r

a_t=3.3\times \frac{21\times 10^{-2}}{2}

a_t=34.65\times 10^{-2}m/s^2

Radial acceleration,a_r=\frac{v^2}{r}

We know that

a=\sqrt{a^2_t+a^2_r}

Using the formula

1.7=\sqrt{(34.65\times 10^{-2})^2+(\frac{v^2}{r})^2}

Squaring on both sides

we get

2.89=1200.6225\times 10^{-4}+\frac{v^4}{r^2}

\frac{v^4}{r^2}=2.89-1200.6225\times 10^{-4}

v^4=r^2\times 2.7699

v^4=(10.5\times 10^{-2})^2\times 2.7699

v=((10.5\times 10^{-2})^2\times 2.7699)^{\frac{1}{4}}

v=0.418 m/s

Hence, the the linear speed (in m/s) of a point on the rim of this wheel at an instant=0.418 m/s

6 0
3 years ago
In which situation is a person doing work on an object?
Hunter-Best [27]

Answer:

the answer is A. A school crossing guard raises a stop sign that weigh 10 N

6 0
2 years ago
Read 2 more answers
Which of the following does not contribute to Wellness
Tomtit [17]
<span>The option that does not contribute to wellness are tendencies. Tendencies are just things that you are more likely to do, or behavior that you are more likely to show, and in no way does that affect your wellness. However, your habits, exercise, and diet do, because all of these things have an impact on both your body and mind, thus creating a wellness of the entire human being.</span>
4 0
3 years ago
People who have been drinking tend to
lilavasa [31]
Well, for one, alcohol impairs someone's ability to perceive distance and see or think clearly. The severity of it depends on the drinker's size. Hope that helped a little.
4 0
3 years ago
Which of the following values could possibly be vector magnitudes
lys-0071 [83]

(a) could possibly become a vector

5 0
2 years ago
Other questions:
  • How do the tension of the cord and the force of gravity affect a pendulum
    14·1 answer
  • After scientists analyze the results of their experiments they
    7·1 answer
  • In a standard gas grill propane tank, there is approximately 4,579 mL of propane (C3H8). At a temperature of 55˚C, the tank has
    9·1 answer
  • It takes about 7000 years for light from the eagle nebula to reach us on earth. using this information, and the speed of light g
    9·1 answer
  • Which statement does not describe the relationship between genes and
    12·2 answers
  • Volleyball was invented in 1905.
    7·2 answers
  • Help please help!!!!!!!!
    8·1 answer
  • Sound wave A is moving through a medium that is decreasing temperature.
    14·2 answers
  • For the following substances: air, water and iron. order of speed of sound waves from low to high
    9·1 answer
  • IN nuclear in oder to slow down fast neutron the target material should contain
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!