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Natali [406]
3 years ago
5

____ have both magnitude and direction. Scalars Vectors

Physics
1 answer:
lisabon 2012 [21]3 years ago
5 0
Vectors is the answer. scalars only multiply the value to another magnitude.
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A 20 kg box on a horizontal frictionless surface is moving to the right at a speed of 4.0 m/s. The box hits and remains attached
yanalaym [24]

Answer:

Work done by the spring is negative

Explanation:

We can answer this question by thinking what is the force acting on the box.

In fact, the force acting on the box is the restoring force of the spring, which is given by Hooke's Law:

F=-kx

where

k is the spring constant

x is the displacement of the box with respect to the equilibrium position of the spring

The negative sign in the equation indicates that the direction of the force is always opposite to the direction of the displacement: so, whether the spring is compressed or stretched, the force applied by the spring on the box is towards the equilibrium position.

The work done by the restoring force is also given by

W=Fx cos \theta

where

F is the restoring force

x is the displacement

\theta is the angle between the direction of the force and the displacement

Here we know that the force is always opposite to the displacement, so

\theta=180^{\circ} \rightarrow cos \theta =-1

Which means that the work done by the spring is always negative, since the direction of the restoring force is always opposite to the direction of motion.

7 0
3 years ago
Two round concentric metal wires lie on a tabletop, one inside the other. The inner wire has a diameter of 18.0 cm and carries a
Helen [10]

Answer:

Explanation:

The wires are in circular shape . They have common center .

magnetic field due to circular wire is given by the formula

B = \frac{\mu_0\times I }{2r}

 where I is current , r is radius of the coil .

magnetic field due to inner wire

= \frac{\mu_0\times 10 }{2\times.09}

magnetic field due to outer wire

= \frac{\mu_0\times I }{2\times.15}

These should be equal  and opposite so that by cancelling each other , they create zero field.

\frac{\mu_0\times 10 }{2\times.09}  = \frac{\mu_0\times I }{2\times.15}

I = 16.66  A

Direction of current should be in opposite direction ie anticlockwise when looking from above.

6 0
4 years ago
Place the tiles in the correct order to describe how a nuclear power plant generates power.
fgiga [73]

Your order is correct here.

4 0
4 years ago
Read 2 more answers
For an object at rest, the normal force equals the gravitational force. What is the sum of these forces called?
Thepotemich [5.8K]

The sum of all forces on an object is called the "net" force on it.

For an object at rest, we call that sum of forces "zero".

8 0
3 years ago
Read 2 more answers
Waldo gets stopped by the police, and the police officer tells Waldo that she caught him on radar doing 50 miles per hour in a 4
sergij07 [2.7K]

Answer:

He calculated his average speed.

Explanation:

Waldo calculated an average of his speed in 2 hours rather than his speed whilst driving which means instead of doing 50/1 hour = 50 mph, he did 50/2hours which is how he got 25 mph. Hope this helps!

5 0
3 years ago
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