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4 years ago

How does an object's position and velocity change as the object accelerates

2 answers:

4 0

If an object is slowing down, then its acceleration is in the opposite direction of its motion. ... In Example A, the object is moving in the positive direction (i.e., has a positive velocity) and is speeding up. When an object is speeding up, the acceleration is in the same direction as the velocity.

rosijanka [135]4 years ago

3 0

Explanation:

Velocity describes how the position changes and acceleration describes how the velocity changes.

If someone is accelerating, it means that he is speeding up or if someone is accelerating, it also means that he is speeding down.

In the slowing down case, the acceleration is in the opposite direction of the velocity. If the car's driver applies a break then there will be a negative acceleration. The velocity of the car decreases here. Then the position of the object will also get change.

In the speeding up case, the acceleration is in the same direction of the velocity. If the car's driver starts his car or accelerates his car then there will be a positive acceleration. The velocity of the car increases here. Then the position of the object will also get change.

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A uniform disk has a mass of 3.7 kg and a radius of 0.40 m. The disk is mounted on frictionless bearings and is used as a turnta

nevsk [136]

Answer:

1.25 kgm²/sec

Explanation:

Disk inertia, Jd =

Jd = 1/2 * 3.7 * 0.40² = 0.2960 kgm²

Disk angular speed =

ωd = 0.1047 * 30 = 3.1416 rad/sec

Hollow cylinder inertia =

Jc = 3.7 * 0.40² = 0.592 kgm²

Initial Kinetic Energy of the disk

Ekd = 1/2 * Jd * ωd²

Ekd = 0.148 * 9.87

Ekd = 1.4607 joule

Ekd = (Jc + 1/2*Jd) * ω²

Final angular speed =

ω² = Ekd/(Jc+1/2*Jd)

ω² = 1.4607/(0.592+0.148)

ω² = 1.4607/0.74

ω² = 1.974

ω = √1.974

ω = 1.405 rad/sec

Final angular momentum =

L = (Jd+Jc) * ω

L = 0.888 * 1.405

L = 1.25 kgm²/sec

4 0

4 years ago

An elevator suspended by a vertical cable is moving downward at a constant speed. The tension in the cable must be A) greater th

True [87]

Answer:

Note F = M a = M g (the resultant force on the elevator is due to gravity)

or Fup = Fc the force exerted on the elevator by the cable

and Fdown = Fe the force exerted on the elevator by gravity

F = M a = Fup - Fdown = zero resultant force on elevator

8 0

3 years ago

1. A 700 kg satellite is in orbit 2.4 x 106 meters from the center of the Earth. What is the force of

nevsk [136]

Answer:

$4.8 \cdot 10^4 N$

Explanation:

The force of gravity acting on the satellite is given by:

$F=\frac{GMm}{r^2}$

where

G is the gravitational constant

$M=5.98\cdot 10^{24} kg$ is the Earth's mass

m is the mass of the satellite

r is the distance of the satellite from the Earth's centre

Here we have

m = 700 kg

$r=2.4\cdot 10^6 m$

Substituting into the equation, we find:

$F=\frac{(6.67\cdot 10^{-11})(5.98\cdot 10^{24})(700)}{(2.4\cdot 10^6)^2}=4.8 \cdot 10^4 N$

Note that the distance mentioned in the problem (2.4 x 10^6 meters) is not realistic, since it is less than the radius of the Earth (6.37 x 10^6 meters).

3 0

3 years ago

(2.) Jerry first walks 5m to East, then 6m to N 60 E, then, she walks 16m to N30'W, 3 finally turns he face and moves 3V3m to so

Vladimir79 [104]

The displacement is determined to be 5.11 m after every direction is plotted on the page.

<h3>What is displacement?</h3>

Displacement is defined as the shortest distance between the two points.

The steps in which Jerry walks;

5m to East

6m to N 60' E,

16m to N30'W,

Turn

3√3 m to the south.

Each and every direction is plotted on the page and obtained that the displacement is found as 5.11 m.

To learn more about displacement refer to the link;

brainly.com/question/10919017

#SPJ1

5 0

2 years ago

According to the Second Law of Thermodynamics, a. any process during which the entropy of the universe increases will be product

Iteru [2.4K]

Answer:

The correct option is;

a. Any process in which the entropy of the universe increases will be product-favored

Explanation:

According to the second law of thermodynamics, the change in entropy of a closed system with time is always positive. That is the entropy of the entire universe, considered as an isolated system, always increases with time, hence the entropy change in the universe will always be positive.

$\Delta S_{universe} = \Delta S_{system} + \Delta S_{surroundings} >0$

Therefore, any process in which the entropy of the universe increases will be product favored.

4 0

3 years ago