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sergey [27]
2 years ago
12

Which statements describe a situation with a displacement of zero? Check all that apply. traveling south for 30 miles, then turn

ing west and traveling another 30 miles riding on a Ferris wheel whose entrance and exit are the same walking around the block, starting from and ending at the same house riding on an escalator from the bottom floor to the top floor running exactly one lap around a racetrack
Physics
2 answers:
velikii [3]2 years ago
5 0
<span>The term "displacement" includes a change of position or change in an innate characteristic. The first option would have someone travel in an L-shape, which definitely is a change in position from the starting point. The second option of Ferris wheel with the same entrance and exit does not involve overall displacement since a person would return to the same place they began. The third option of walking around the block does not involve overall displacement since, again, the person would return to the same place they began. The fourth option of an escalator ride does involve overall displacement because a person would finish their journey in a different vertical location from where they started. The last option does not involve overall displacement because one lap around a track will return you to the same place you began.</span>
deff fn [24]2 years ago
4 0

Answer:

Explanation:

riding on a Ferris wheel whose entrance and exit are the same

walking around the block, starting from and ending at the same house

running exactly one lap around a racetrack

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A woman is applying 300N/m2 of pressure on to door with her hand. Her hand has area of 0.02m2. Work out the force being applied​
never [62]

Answer:

6N

Explanation:

Given parameters:

Pressure applied by the woman  = 300N/m²

Area = 0.02m²

Unknown:

Force applied  = ?

Solution:

Pressure is the force per unit area on a body

        Pressure  = \frac{force}{area}

         Force  = Pressure x area

        Force  = 300 x 0.02  = 6N

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2 years ago
A puck rests on a horizontal frictionless plane. A string is wound around the puck and pulled on with constant force. What fract
Ivan

Answer:

Explanation:

Let v be the linear velocity ,  ω be the angular velocity  and I be the moment of inertia of the the puck.

Kinetic energy ( linear ) = 1/2 mv²

Rotational kinetic energy = 1/2 I ω²

I = 1/2 m r² ( m and r be the mass and radius of the puck )

Rotational kinetic energy = 1/2 x1/2 m r² ω²

= 1/4 m v² ( v = r ω )

Total energy

= Kinetic energy ( linear ) + Rotational kinetic energy

= 1/2 mv² +  1/4 m v²

= 3/4 mv²

rotational K E / Total K E = 1/4 m v² / 3/4 mv²

= 1 /3

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3 0
2 years ago
A large solar panel on a spacecraft in Earth orbit produces 1.0 kW of power when the panel is turned toward the sun. What power
Mandarinka [93]

Answer:

e*P_s = 11 W

Explanation:

Given:

- e*P = 1.0 KW

- r_s = 9.5*r_e

- e is the efficiency of the panels

Find:

What power would the solar cell produce if the spacecraft were in orbit around Saturn

Solution:

- We use the relation between the intensity I and distance of light:

                                  I_1 / I_2 = ( r_2 / r_1 ) ^2

- The intensity of sun light at Saturn's orbit can be expressed as:

                                  I_s = I_e * ( r_e / r_s ) ^2

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                                  I_s = 11 W / e*a

- We know that P = I*a, hence we have:

                                  P_s = I_s*a

                                  P_s = 11 W / e

Hence,                       e*P_s = 11 W

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The correct option is B.
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3 0
2 years ago
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Answer:0.502kg

Explanation:

F4om the relation

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P.t=ML

1260 * 15 *60 = M * 22.6 * 10^5

M= 1134000/(22.6 *10^5)

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