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zheka24 [161]
3 years ago
12

Please Help! A ball is thrown straight up from the ground. What way does its acceleration point at the top?

Physics
1 answer:
QveST [7]3 years ago
3 0

Answer: A. Vertical

Explanation:

If the ball is thrown straight up from the ground (asuming the ground as height 0), this means its initial velocity is greater than zero.

While the ball rises and gains height, its velocity decreases until it reaches its maximum height where it stops (velocity equal to zero) and then it begins to fall to the ground.

Now, <u>during all the movement, the ball has an acceleration</u>, which is the acceleration due gravity (9.8 m/s^{2}  on Earth), even at the top or maximum height (when the ball stops just for fraction of time), and this acceleration points vertical and downward to the Earth's center.

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The displacement (in centimeters) of a particle moving back and forth along a straight line is given by the equation of motion s
Veseljchak [2.6K]

Answer:

v_{avg} = 0

Explanation:

The object is moving to and fro about its mean position

and the equation for its displacement is given as

s = 5 sin(\pi t) + 5 cos(\pi t)

now in one complete time period we know that the the object will complete its one oscillation

So the change in the position of the object in one complete time period will be ZERO

so here we can say that

v_{avg} = \frac{displacement}{time}

since change in position is zero

so displacement = 0

v_{avg} = 0

4 0
3 years ago
WILL GIVE BRAINLIEST!!! NO LINKS PLZ!!!!
Nesterboy [21]

Answer:

Explanation:

a) the acceleration of the puck on the rough ice.

a = μg = 0.550(9.81) = 5.3955 = 5.40 m/s²

 (comes from μ = F/N = ma/mg = a/g)

b) the distance from the end boards the puck is when it comes to a stop.

v² = u² + 2as

0² = 12.0² + 2(-5.40)s

s = 13.3 ft

so distance from the boards is

15.7 - 13.3 = 2.4 m

by the way...that's some VERY rough ice...more like sand.

3 0
2 years ago
Early LCD backlights use _______________ technology, popular for its low power use, even brightness, and long life.
Gala2k [10]

Answer:

cold cathode fluorescent lamp

Explanation:

A cold cathode fluorescent lamp (CCFL) is a lighting system that uses two phenomena: electron discharge and fluorescence.

CCFLs are mainly used as light sources for backlights, since they are compact and durable than ordinary fluorescent lamps. They exhibit a wide range of brightness and color (color temperature and chromaticity) that can be achieved by varying the pressure and type of the material injected into the glass tube. The thickness and type of the phosphor used to coat the inner wall of the tube also plays a role in altering the color and brightness.

8 0
3 years ago
The electric field is strongest where equipotential curves are:_______.A) closest togetherB) farthest apartC) most nearly straig
cluponka [151]

Answer:

A closest

Explanation:

This is because the electric field will be strongest or largestwhen the equipotential curves are closest together

We know that the field is

E= V/d

Where is distance and we see that d being the denominator will only make E bigger if it becomes smaller that is the curves closest

3 0
3 years ago
Which of the following is the accepted scientific opinion about the current warming trend?
bija089 [108]
The answer is there is no one accepted scientific opinion about the current warming trend in the global climate 
8 0
3 years ago
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