All categories

4 years ago

1. The vector −3 is:

Physics

1 answer:

lidiya [134]4 years ago

8 0

Answer:A

Explanation:

Is in The opposite direction

You might be interested in

1. if the mass of something increases, it is harder to get it to move. this means the force required to accelerate it _____.

jeyben [28]

1.A Increases
2.True
.............

7 0

3 years ago

Read 2 more answers

One kind of baseball pitching machine works by rotating a light and stiff rigid rod about a horizontal axis until the ball is mo

Veseljchak [2.6K]

Answer:

a. ac = 1844.66 m/s²

b. Fc = 265.63 N

Explanation:

The centripetal acceleration of the ball is given as follows:

ac = v²/r

where,

ac = centripetal acceleration = ?

v = speed of ball = (87 mph)(1 h/ 3600 s)(1609.34 m / 1 mile) = 38.9 m/s

r = radius of path = 82 cm = 0.82 m

Therefore,

ac = (38.9 m/s)²/0.82 m

ac = 1844.66 m/s²

The centripetal force is given as:

Fc = (m)(ac)

Fc = (0.144 kg)(1844.66 m/s²)

Fc = 265.63 N

6 0

3 years ago

A child walks due east on the deck of a ship at 2 miles per hour. the ship is moving north at a speed of 18 miles per hour. find

garik1379 [7]

Refer to the figure shown below.

The velocity of the child and the velocity of the ship should be added vectorially to find the speed and direction of the child relative to the water surface.

The magnitude of the child's velocity is
v = √(2² + 18²) = 18.11 mph

The direction of the child's speed is
θ = tan⁻¹ (18/2) = tan⁻¹ 9 = 83.7° north of east or counterclockwise from the eastern direction.

Answer:
The magnitude is 18.1 mph.
The direction is 84° north of east.

8 0

3 years ago

How fast must a 1000 kg car be moving to have a kinetic energy of:

VMariaS [17]

Answer:

$\mathrm{(a)}\: 2\: \mathrm{m/s}\\\mathrm{(b)}\: 20\: \mathrm{m/s}\\$

Explanation:

The kinetic energy of an object is given by $KE=\frac{1}{2}mv^2$ where $m$ is the mass of the object and $v$ is the velocity of the object.

We can set up the following equations with the information given:

$\mathrm{(a)}\: 2.0\cdot 10^3=\frac{1}{2}\cdot 1000\cdot v^2, \\v=\fbox{$2\: \mathrm{m/s}$}$

For part B, we have the same equation, but kinetic energy is now $2.0\cdot 10^5$ .

Therefore:

$\mathrm{(b)}\: 2.0\cdot 10^5=\frac{1}{2}\cdot 1000\cdot v^2, \\v=\fbox{$20\: \mathrm{m/s}$}$ .

6 0

3 years ago

What would be the projectile's initial speed?

zalisa [80]

Math is the process of using the given information, along with
all the general stuff that you know, to find the missing information.
With no given information, we have no way to even guess at
an answer.

8 0

4 years ago