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il63 [147K]
3 years ago
5

An 80.0 kg man sits on a scale in his car. The car is driving at a speed of 11.0 m/s right as it passes over the top of a semici

rcular hill of radius 17.0 m. What does the scale read right when he is at the top
Physics
1 answer:
Lady_Fox [76]3 years ago
6 0

Answer:

F / g = 138 kg

Explanation:

For this exercise let's use Newton's second law

    F- W = m a

the force is equal to the back of the balance

in this case the acceleration is centripetal

    a = v² / r

we substitute

   F - m g = m v² / r

   F = m (g + v²/ r)

calculus

   F = 80 (9.8 + 11²/17)

   F = 1353 N

the balance reading is this value between gravity

   F / g = 1353 / 9.8

   F / g = 138 kg

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Starting from rest, a solid sphere rolls without slipping down an incline plane. At the bottom of the incline, what does the ang
Marrrta [24]

Answer:

2/R*sqrt (g*s*sin(θ)) = w

Explanation:

Assume:

- The cylinder with mass m

- The radius of cylinder R

- Distance traveled down the slope is s

- The angular speed at bottom of slope w

- The slope of the plane θ

- Frictionless surface.

Solution:

- Using energy principle at top and bottom of the slope. The exchange of gravitational potential energy at height h, and kinetic energy at the bottom of slope.

                                         ΔPE = ΔKE

- The change in gravitational potential energy is given as m*g*h.

- The kinetic energy of the cylinder at the bottom is given as rotational motion: 0.5*I*w^2

- Where I is the moment of inertia of the cylinder I = 0.5*m*R^2

We have:

                              m*g*s*sin(θ) = 0.25*m*R^2*w^2

                              2/R*sqrt (g*s*sin(θ)) = w

- The angular velocity depends on plane geometry θ , distance travelled down slope s, Radius of the cylinder R , and gravitational acceleration g

3 0
3 years ago
Photosynthesis uses solar energy and converts it to what type of energy
Anni [7]
Photosynthesis in plants converts solar energy into chemical energy using electrons and protons from water.
7 0
3 years ago
PLEASE HELP WILL GIVE BRAINLIEST!!!
Elan Coil [88]

The spring constant is 181.0 N/m

Explanation:

We can solve the problem by applying the law of conservation of energy. In fact, the elastic potential energy initially stored in the compressed spring is completely converted into gravitational potential energy of the dart when the dart is at its maximum height. Therefore, we can write:

\frac{1}{2}kx^2 = mgh

where the term on the left represents the elastic potential energy of the spring while the term on the right is the gravitational potential energy of the dart at maximum height, and where

k is the spring constant of the spring

x = 2.08 cm = 0.0208 m is the compression of the spring

m = 12.3 g = 0.00123 kg is the mass of the dart

g=9.8 m/s^2 is the acceleration due to gravity

h = 3.25 m is the maximum height of the dart

Solving for k, we find:

k=\frac{2mgh}{x^2}=\frac{2(0.00123)(9.8)(3.25)}{(0.0208)^2}=181.0 N/m

Learn more about potential energy:

brainly.com/question/1198647

brainly.com/question/10770261

#LearnwithBrainly

6 0
3 years ago
Which of the following correctly describes the relative air pressure at the center of a hurricane, with respect to the horizonta
vampirchik [111]

Explanation:

The pressure of hurricane which is high decreases gradually as we move higher . The pressure is maximum at the surface . Hence the relative air pressure is higher at the surface and low at the top . Like wise the pressure is low at the center and keeps on increasing when we move outside . Hence the answer is pressure is high at surface and low aloft.

6 0
3 years ago
What is the difference in atoms involved in a chemical reaction and a nuclear reaction?
NeX [460]
In chemical reactions, electrons are transferred.
While in nuclear reactions, protons and neutrons are the ones transferred.

Hope this helps.<span />
4 0
3 years ago
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