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love history [14]
4 years ago
9

What’s the answer to this

Physics
1 answer:
ladessa [460]4 years ago
6 0
Choices  1,  2,  and 4 . . . . . Yes

Choices  3  and 5 . . . . . No
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An object that is moving in a linear path with an acceleration in the direction opposite to the motion has a(n) ______________ v
Bas_tet [7]
An object that is moving in a linear path with an acceleration in the direction opposite to the motion has a(n) _______changing_______ velocity.
5 0
4 years ago
If a car has a velocity of 85 km/hr, how long will it take to accelerate to 45 km/hr if the acceleration is -3 km/hr/sec?
weqwewe [10]

Answer:

Time, t = 13.34 seconds.

Explanation:

Given the following data;

Initial velocity, u = 85km/hr to meters per seconds = 85*1000/3600 = 23.61 m/s

Final velocity, v = 45km/hr to meters per seconds = 45*1000/3600 = 12.5 m/s

Acceleration, a = -3 km/hr/sec to meters per seconds square = -3*1000/3600 = -0.833m/s²

To find the time;

Acceleration = (v - u)/t

-0.833 = (12.5 - 23.61)/t

-0.833t = -11.11

t = 11.11/0.833

Time, t = 13.34 seconds.

6 0
3 years ago
Which equation represents the law of conservation of energy in a closed system?
Irina-Kira [14]

Answer:

KE + PE = KE + PE

Explanation:

In a closed system, the mechanical energy of the system is constant.

Mechanical energy is given by the sum of kinetic energy and potential energy; mathematically:

U = KE + PE

where

KE is the kinetic energy

PE is the potential energy

This means that if we consider two situations, one at the beginning and one at the end, the value of U will not change if the system is closed; this means that the sum KE + PE will remain the same, so we can write:

KE + PE = KE + PE

7 0
4 years ago
Read 2 more answers
When an object accelerates, what about its motion changes? Question 1 options: Speed must change, but not velocity. Both speed a
QveST [7]

Answer:

The velocity must change but not speed.

Explanation:

  • Velocity is defined as the displacement by time. Whereas speed is expressed as the distance between two successive positions of the body to the time interval it took to travel.

                <em>Velocity,        V = D / t        m/s</em>

<em>                  Speed,          s = d /t          m/s        </em>  

  • Velocity is a vector quantity that has a magnitude and direction.
  • The speed is a scalar quantity having only the magnitude.
  • At any instant of time, the magnitude of the velocity is always equal to the magnitude of the speed. The magnitude of velocity, |<em>v </em>| = magnitude of speed, |<em>v </em>|. The magnitude is always positive
  • The acceleration of a body is defined as the rate of change of velocity to time.

                               <em>   a = (v - u) / t      m/s²</em>

  • If a body is accelerating, It varies its velocity with respect to time.
  • In case of uniform circular motion, the speed remains constant, but the velocity changes continuously.

So, in the case of circular motion if an object accelerates, velocity must change but speed remains constant.

5 0
4 years ago
A dumped harmonic oscillator of a mass of 500 g has a period of 0.5 second. The amplitude of the oscillation is decreasing 2.0 %
inn [45]

Answer:

The answer is below

Explanation:

The amplitude decreases by 2%  during each oscillation. Hence the decrease in amplitude can be represented by an exponential decay in the form:

y = abˣ; where x ad y are variables, a is the initial value and b is the factor.

Let y represent the amplitude after x oscillations. Since the initial amplitude is 10 cm, hence:

a = 10 cm, b = 2% = 0.02.

Therefore:

y = 10(0.02)ˣ

The amplitude after 25 oscillations is gotten by substituting x = 25 into the equation. Hence:

y = 10(0.02)²⁵

y= 3.355 * 10⁻⁴² cm

The amplitude after 25 oscillations is 3.355 * 10⁻⁴² cm

7 0
3 years ago
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