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4 years ago

How many planets are there?

2 answers:

8 0

- - Not counting Pluto there are 8 planets, although some people still believe Pluto could be considered one, then it would be 9.

larisa86 [58]4 years ago

4 0

Their are 8 planets.
<span>Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune.
</span>Their were 9 planets.

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If the frog lands with a velocity equal to its average velocity and comes to a full stop 0.25s later, what is the frog’s average

Nina [5.8K]

Answer:

Average accelation = -4V

Explanation:

$a=\frac{V-V0}{t}$

V=0 m/s (because the frog stopped)

V0 = V (average velocity)

t= 0,25 s

So;

$a=\frac{V-V0}{t}=\frac{0-V}{0.25}=-4V$

4 0

3 years ago

Can anyone tell me the answer to this problem:)

Mrrafil [7]

The answer is B, lithium would become positive and bromium would become negative.

6 0

4 years ago

A ball is launched at an angle of 39.8 degrees up from the horizontal, with a muzzle velocity of 6.6 meters per second, from a l

Burka [1]

Answer:

1.85 m

Explanation:

The horizontal velocity of the ball is

$v_x = v cos \theta = (6.6 m/s) cos 39.8^{\circ}=5.1 m/s$

The horizontal distance travelled is

d = 2.7 m

And since the motion along the horizontal direction is a uniform motion, the time taken is

$t= \frac{d}{v_x}=\frac{2.7 m}{5.1 m/s}=0.53 s$

The vertical position of the ball is given by

$y= h + u_y t - \frac{1}{2}gt^2$

where

h = 1 m is the initial heigth

$u_y = v sin \theta = (6.6 m/s) sin 39.8^{\circ}=4.2 m/s$ is the initial vertical velocity

g = 9.82 m/s^2 is the acceleration due to gravity

Substituting t = 0.53 s, we find the height of the ball at this time:

$y=1 m + (4.2 m/s)(0.53 s) - \frac{1}{2}(9.82 m/s^2)(0.53 s)^2=1.85 m$

6 0

3 years ago

True or false? One reason gases are easy to compress is because their particles have higher energy.

erik [133]

True

Why are gases easy to compress in terms of particles?

Particles are far apart from each other because there are very weak forces of attraction between them. They move fast in all directions. Because of this, gases don't have a definite shape or volume and fill any container. Because there is lots of free space between particles, gases can easily be compressed.

6 0

3 years ago

A bookcase has a base of 1 m long and 0.5 m wide. It has a mass of 300kg. Find the pressure it exerts on the floor in kPa.

Snezhnost [94]

$1m*0.5m=0.5m^2\\
g=10\frac{m}{s^2}\\
300kg*10\frac{m}{s^2}=3000N\\
3000N--0.5m^2\\
\ \ x\ \ --\ 1\\
x=6000Pa=60kPa$

4 0

3 years ago