All categories

3 years ago

What two things do you need to know to describe the velocity of an object?

Physics

2 answers:

mezya [45]3 years ago

4 0

By definition, we have that the speed of an object is given by:

$v = \frac{d}{t}$

Where,

d: distance [in units of length: meters, feet, miles]

t: time [in units of time: minutes, seconds, hours]

Therefore, knowing the distance traveled, and the time to travel this distance, we can know the speed of an object.

Then, since velocity is a vector, then we need the direction of the vector.

Therefore, the velocity vector can be written as:

$v = |v|(cos(\alpha) i + sin(\alpha) j)$

Answer:

two things you need to know to describe the velocity of an object are:

1) Magnitude (speed)

2) direction

pickupchik [31]3 years ago

3 0

The distance it traveled and the time that it took to travel that distance

You might be interested in

The nose of an ultralight plane is pointed south, and its airspeed indicator shows 28 m/s . the plane is in a 18 m/s wind blowin

leva [86]

<span>Here I think you have to find the velocity in x and y components where x is east and y is north
So as air speed indicator shows the negative speed in y component and adding it in
air speed while multiplying with the direction component we will get the velocity as velocity is a vector quantity so direction is also required
v=-28 m/s y + 18 m/s (- x/sqrt(2) - y/sqrt(2))
solving
v= -12.7 m/s x-40.7 m/s y
if magnitude of velocity or speed is required then
speed= sqrt(12.7^2 + 40.7^2)
speed= 42.63 m/s
if angle is asked
angle = arctan (40.7/12.7)
angle = 72.67 degrees south of west</span>

6 0

3 years ago

A ball is dropped from rest from a high window of a tall building and falls for 4 seconds. Neglecting air resistance, the final

Semenov [28]

Answer:

The final velocity of the ball is 39.2 m/s.

Explanation:

Given that,

A ball is dropped from rest from a high window of a tall building.

Time = 4 sec

We need to calculate the final velocity of the ball

Using equation if motion

$v=u+gt$

Where, v = final velocity

u = initial velocity

g = acceleration due to gravity

t = time

Put the value into the formula

$v=0+9.8\times4$

$v=39.2\ m/s$

Hence, The final velocity of the ball is 39.2 m/s.

6 0

3 years ago

A particle moving in the x direction is being acted upon by a net force f(x)=cx2, for some constant

makkiz [27]

The work-energy theorem states that the change in kinetic energy of the particle is equal to the work done on the particle:
$\Delta K = W$
The work done on the particle is the integral of the force on dx:
$W= \int\limits^{3L}_L {F(x)} \, dx = \int\limits^{3L}_L {cx^2} \, dx = \frac{26}{3}cL^3$
So, this corresponds to the change in kinetic energy of the particle.

6 0

2 years ago

Whats the speed of darkness?

lianna [129]

The same speed of light, the fastest possible

darkness is just the absence of light therefore once light leaves darkness returns. making darkness have the same speed of light

3 0

2 years ago

Two factor that affect gravitational force

Gnoma [55]

When dealing with the force of gravity between two objects, there are only two things that are important – mass, and distance. The force of gravity depends directly upon the masses of the two objects, and inversely on the square of the distance between them.

6 0

2 years ago