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3 years ago

Should I take physics or biology?

Physics

2 answers:

Readme [11.4K]3 years ago

8 0

depends on which one is more appealing to you

Delvig [45]3 years ago

7 0

Physics !!!! :) i think it’s more fun

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If coal was our primary source for generating electricity, what effect would this have on individuals and the environment?

Sonja [21]

If coal was our Primary source it would help the world but population would be higher and it can damage animals,people will be able to drive calm without problems ithe world

3 0

4 years ago

Do the negative ions tend to be metals or nonmetals?

spayn [35]

Nonmetals! is your answer make me the brainiest please

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3 years ago

A ball is kicked at an angle of 35° with the ground.a) What should be the initial velocity of the ball so that it hits a target

stiks02 [169]

Answer:

a.18.5 m/s

b.1.98 s

Explanation:

We are given that

$\theta=35^{\circ}$

a.Let $v_0$ be the initial velocity of the ball.

Distance,x=30 m

Height,h=1.8 m

$v_x=v_0cos\theta=v_0cos35$

$v_y=v_0sin\theta=v_0sin35$

$x=v_0cos\theta\times t=v_0cos35\times t$

$t=\frac{30}{v_0cos35}$

$h=v_yt-\frac{1}{2}gt^2$

Substitute the values

$1.8=v_0sin35\frac{30}{v_0cos35}-\frac{1}{2}(9.8)(\frac{30}{v_0cso35})^2$

$1.8=30tan35-\frac{6574.6}{v^2_0}$

$\frac{6574.6}{v^2_0}=21-1.8=19.2$

$v^2_0=\frac{6574.6}{19.2}$

$v_0=\sqrt{\frac{6574.6}{19.2}}=18.5 m/s$

Initial velocity of the ball=18.5 m/s

b.Substitute the value then we get

$t=\frac{30}{18.5cos35}$

t=1.98 s

Hence, the time for the ball to reach the target=1.98 s

7 0

3 years ago

A rock is thrown from the upper edge of a tall cliff at some angle above the horizontal. It reaches its highest point and starts

Marianna [84]

Answer:

B) Its horizontal velocity component is the same as it was just as it was launched

Explanation:

From dynamic we know that free falling objects had two components of velocity

The only acceleration that takes place in this case is gravity in the y-component of velocity

$v_{vx}=v_{ox}+at\\v_{y}=v_{oy}+gt$

Since a=0 and $g=-9.8m/s^2=-32.2ft/s^2$ that means that the velocity at the y-component changes with time but the horizontal component remain the same

$v_{x}=v_{ox}$

This means that the horizontal velocity is not 0 but is <u><em>the same as it was just as it was launched</em></u>

8 0

4 years ago

If you place a balloon in the freezer it will______

matrenka [14]

B. Deflate because volume is inversely proportional to temperature

8 0

3 years ago