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Len [333]
3 years ago
8

In physics, what is the positive and negative sign used for when applied to velocity and acceleration?

Physics
1 answer:
Kobotan [32]3 years ago
6 0

Answer:

Opposite direction

Explanation:

For example: The first object travels in the direction pointing to east, while the other one travels pointing to the west.

The first object will have a positive value while the second one will have a negative, cause it's going to the opposite direction

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The 10-lb block has a speed of 4 ft>s when the force of F = (8t2) lb is applied. Determine the velocity of the block when it
Zanzabum

Answer:

The velocity of the block is 231650.8 ft/s

Explanation:

Knowing

W = 10 lb

v0 = u = 4 ft/s

F = 8 t^{2} lb

ms = 0.2

Applying the newton second law

ΣFy = 0

N - W = 0 --> N = W = 10 lb

ΣFx = ma_{x}

F - ms N = ma

8t^{2}- 0.2(10) = \frac{10}{32.2} a

a = 3.22 (8t^{2}  - 2)

Using Kinematics

a = dv/dt

\int\limits^v_u  dv = \int\limits^t_0 {a} \, dt = \int\limits^t_o {3.22 (8t^{2}  - 2)} \, dt

v - 4 = 3.22 (\frac{8}{2} t^{3} - 2t)

when t = 30

v = 231650.8 ft/s

5 0
3 years ago
A teacher does a demonstration in front of a class. For the demonstration, a motion sensor is placed at the end of a long, horiz
pogonyaev

Answer:

с. The net work done on the cart is equal to the change in kinetic energy of the cart.

Explanation:

In the context, a motion sensor detects the motion of the cart where a cart is used to move using a force sensor that is attached to the cart of certain mass. As the cart moves with a speed at a particular time, the computer records both the readings on the force sensor as well as the motion sensor. From these readings the is can be concluded that the work done on the cart is same as the change in the kinetic energy in the cart.

8 0
3 years ago
Which condition must exist in order for conduction to occur between two substances
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3 years ago
The force you have to overcome to start an object moving is _____
MAVERICK [17]
The forece you have to overcome to start an object moving is called Inertia.
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4 years ago
A bird flies 3.7 meters in 46 seconds, what is its speed?
victus00 [196]

Answer:

Speed is 0.08 m/s.

Explanation:

Given the distance that the bird flies = 3.7 meters

The time is taken by the bird to fly the 3.7 meters = 46 seconds  

We have given distance and time. Now we have to find the speed at which the bird flies. So, to calculate the speed of the bird we have to divide the distance by the time.  

Below is the formula to find the speed.

Speed = Distance / Time

Now insert the given value in the formula.

Speed = 3.7 / 46 = 0.08 m/s

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4 years ago
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