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fgiga [73]
3 years ago
10

28. Multiple-Concept Example 5 reviews many of the concepts that play roles in this problem. An extreme skier, starting from res

t, coasts down a mountain slope that makes an angle of 25.0 with the horizontal. The coefficient of kinetic friction between her skis and the snow is 0.200. She coasts down a distance of 10.4 m before coming to the edge of a cliff. Without slowing down, she skis off the cliff and lands downhill at a point whose vertical distance is 3.50 m below the edge. How fast is she going just before she lands
Physics
1 answer:
Maksim231197 [3]3 years ago
5 0

Answer: 7.78m/s

Explanation: As the the skier slide down the height, we assume the motion of a body, slidind down an incline plane.

Force down the plane= [email protected]

Frictional force= umg

u= coefficient of friction

Net force on skier = [email protected] umg

ma = [email protected]

a = g([email protected] - u) = 9.8 (sin 25- 0.2)

a = 9.8 × (0.4226-0.2) = 9.8 × 0.2226

a = 2.18m/s²

Using the formula V² = U² + 2aH

Where H = (10.4+ 3.5)=total height of descent before landing, U= 0.

V = √ 2 × 2.18× 13.9 = √60.604

V = 7.78m/s

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A beam of protons moves in a circle of radius 0.20 m. The protons move perpendicular to a 0.36-T magnetic field. (a) What is the
gregori [183]

Answer:

a) v=6.898\times 10^{6}\ m.s^{-1} is the speed of each proton

b) F_c=3.97\times 10^{-13}\ N

Explanation:

Given:

radius of path of motion, r=0.2\ m

we know charge on protons, q=1.6\times 10^{-19}\ C

magnetic field strength, B=0.36\ T

we've mass of proton, m=1.67\times 10^{-27}\ kg

a)

From the equivalence of magnetic force and the centripetal force on the proton:

F_B=F_C

q.v.B=\frac{m.v^2}{r}

q.B=\frac{m.v}{r}

where:

v = speed of the proton

(1.6\times 10^{-19})\times 0.36=\frac{1.67\times 10^{-27}\times v}{0.2}

v=6.898\times 10^{6}\ m.s^{-1} is the speed of each proton

b)

Now the centripetal force on each proton:

F_c=m.\frac{v^2}{r}

F_c=1.67\times 10^{-27}\times \frac{(6.898\times 10^6)^2}{0.2}

F_c=3.97\times 10^{-13}\ N

6 0
4 years ago
A 100g mass is swung around a tube 50 times in 1 minute. A. Calculate the angular velocity of the 100 g mass.
sergey [27]
The angular velocity is defined as "the angle changing over time." 

From the given of the problem:

m = 100g
rate of revolution = 50 rev / min

Therefore, using the formula:

angular velocity = rate of revolution x 2*pi / revolution

Substituting:

angular velocity = (50 revs / min) x ( 2*pi radians / rev ) = 100*pi radians / min

As you can see, mass is not a part of the equation for solving the angular velocity therefore the amount of mass does not affect its value.


8 0
3 years ago
1. Her angular speed increases because by pulling in her arms she creates a net torque in the direction of rotation. 2. Her angu
choli [55]

Answer:

3. Her angular speed increases because her angular momentum is the same but her moment of inertia decreases

Explanation:

II ωi the intial angular momentum of the skater. Her angular momentum changes to If ωf after pulling her arms in.

It must be noted that If is less than II, then it is because her arms now go round not far from the rotation axis which brings down the mementos of inertia.

Angular momentum does not change since torque is O.

Note: the mathematical representations are better written on the attached diagram.

5 0
4 years ago
Read 2 more answers
Chris threw a basketball a distance of 27.5 m to score and win his
salantis [7]

Answer:

v₀ = 16.55 m/s

Explanation:

This motion of the ball can be modeled as a projectile motion with following data:

R = Range of Projectile = 27.5 m

θ = Launch Angle = 50°

g = acceleration due to gravity = 9.81 m/s²

v₀ = Initial Speed of Ball = ?

Therefore, using formula for range of projectile, we have:

R = \frac{v_{0}^2\ Sin2\theta}{g}\\\\v_{0}^2 = \frac{Rg}{Sin2\theta}\\\\v_{0}^2 = \frac{(27.5\ m)(9.81\ m/s^2)}{Sin100^o}\\\\v_{0} = \sqrt{273.93\ m^2/s^2}

<u>v₀ = 16.55 m/s</u>

8 0
3 years ago
When current first leaves the battery, how much voltage does it have
rjkz [21]

Answer:

depends on the voltage of battery

Explanation:

for example if you connect a battery of 6V,6V will be  provided

8 0
3 years ago
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