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3 years ago

A skier is skiing down a slope on the mountain.

Physics

1 answer:

uysha [10]3 years ago

4 0

The mechanical energy isn't conserved. Some energy is lost to friction.

Option A.

<h3>Explanation:</h3>

The mechanical energy is defined as the energy of a body which it achieves by virtue of its position and velocity. The mechanical energy are of two types - potential energy and kinetic energy. The potential energy is the energy of the body which it achieves by means of its relative position and is directly proportional to the height of the body from its relative plane. Whereas the kinetic energy of the body is achieved by virtue of its velocity and is directly proportional to the square of velocity of the body.

As the mountaineer is skiing down the slope of a mountain, the potential energy of the person is gradually changing into his kinetic energy. Had it been in an ideal situation, the potential energy lost would have been just equal to the kinetic energy gained by the person. But there's friction which opposes the speed of the body and reduces the velocity. Thus the kinetic energy will be lost to some extent and the energy won't be conserved.

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Two air track carts move along an air track towards each other. Cart A has a mass of 450 g and moves toward the right with a spe

Blizzard [7]

Answer:

The right answer is D) the total momentum of the system is 0.047 kg · m/s toward the right.

Explanation:

Hi there!

The total momentum of the system is given by the sum of the momentum vectors of each cart. The momentum is calculated as follows:

p = m · v

Where:

p = momentum.

m = mass.

v = velocity.

Then, the momentum of the system will be the momentum of cart A plus the momentum of cart B (let´s consider the right as the positive direction):

mA · vA + mB · Vb

0.450 kg · 0.850 m/s + 0.300 kg · (- 1.12 m/s) = 0.047 kg · m/s

The right answer is D) the total momentum of the system is 0.047 kg · m/s toward the right.

6 0

3 years ago

inna [77]

Answer:

5g/cm

Explanation:

denisty=mass/volume

100/20

5g/cm

8 0

2 years ago

The temperature of a chemical reaction ranges between 40 degrees Celsius and 180 degrees Celsius. The temperature is at its lowe

Vikki [24]

The best and most correct answer among the choices provided by the question is f(t) = −70 cos pi over 6t + 110.


Hope my answer would be a great help for you.
If you have more questions feel free to ask here at Brainl

3 0

3 years ago

S To minimize neutron leakage from a reactor, the ratio of the surface area to the volume should be a minimum. For a given volum

goblinko [34]

To minimize neutron leakage from a reactor, the ratio of the surface area to the volume should be a minimum. For a given volume V , ratio for (c) a parallelepiped of dimensions × 2 a will be $\frac{6.29961}{c^\frac{1}{3} }$

What will be the ratio of surface area and the volume of the parallelepiped

We will proceed by stating the equations of the surface area and the volume of each shape, and then identifying each of the surface area and the volume, we will take their ratios, and as it is asking for the shape which has the minimum surface area to volume ratio, therefore at some given volume, $V=const$ .

The parallelepiped whose dimension is given as

$2a,a,a$

the surface area and the volume is given respectively by:

$A=2(2a \times a)+2(a \times 2a)+2(a \times a)=10a^{2}$

$V=2a^{3}$

Let the volume be equal to the constant c, we get:

$V=c=2a^{3}\\a=(\frac{c}{2} )^\frac{1}{3}$

Hence the ratio is given by:

$\frac{A}{V} =\frac{10a^{2}}{2a^{3}}=\frac{5}{a}$

Calculating the constants, by substituting the value of $a$ in (3), we get:

$\frac{A}{V}=\frac{6.29961}{c^\frac{1}{3} }$

To learn more about parallelepiped, refer to:

brainly.com/question/27975136

#SPJ4

5 0

1 year ago

Two Jupiter-size planets are released from rest 1.40×10^11 m apart.. What are their speeds as they crash together?

Sonbull [250]

M₁ = mass of planet #1
M₂ = mass of planet #2
M = total mass
R₁ = radius of planet #1
R₂ = radius of planet #2
d₁ = initial distance between planet centers
d₂ = final distance between planet centers
a = semimajor axis of plunge orbit
v₁ = relative speed of approach at distance d₁
v₂ = relative speed of approach at distance d₂

M₁ = M₂ = 1.8986e27 kilograms
M = M₁ + M₂ = 3.7972e27 kg
G = 6.6742e-11 m³ kg⁻¹ sec⁻²
GM = 2.5343e17 m³ sec⁻²
d₁ = 1.4e11 meters
a = d₁/2 = 7e10 meters
R₁ = R₂ = 7.1492e7 meters
d₂ = R₁ + R₂ = 1.42984e8 meters
v₁ = 0
v₂ = √[GM(2/d₂−1/a)]

v₂ = 59508.4 m/s 

The time to fall is 1337.7 days

.I hope my answer has come to your help. Thank you for posting your question here in Brainly.

7 0

3 years ago