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Lilit [14]
4 years ago
7

Why is the nucleus positive in charge?

Physics
1 answer:
11Alexandr11 [23.1K]4 years ago
5 0

Answer:

The nucleus has an overall positive charge as it contains the protons. Every atom has no overall charge (neutral). This is because they contain equal numbers of positive protons and negative electrons. These opposite charges cancel each other out making the atom neutral.

Explanation:

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Which freezes faster, hot water or cold water?
Digiron [165]
Hot water<span> seems to </span>freeze faster<span> than </span>cold water<span>, known as the Mpemba effect. The effect was named after the Tanzanian student who in 1963 noticed that </span>hot<span> ice cream mix </span>freezes faster<span> than a </span>cold<span> one. hope this helped</span>
8 0
3 years ago
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What’s the force of a pitching machine on a baseball? Baseballs pitched by a machine have a horizontal velocity of 30 meters/sec
Leya [2.2K]
The acceleration of the baseball is:
a= \frac{v_f-v_i}{\Delta t}
where v_f and v_i are the final and initial speed of the ball, and \Delta t is the time interval in which the force acted.

Replacing the numbers, we get
a= \frac{30 m/s-0m/s}{0.5 s}=60 m/s^2
And at this point, we can use Newton's second law F=ma to find the value of the force of the pitching machine:
F=ma=(0.15 kg)(60 m/s^2)=9 N
5 0
3 years ago
A stagehand starts sliding a large piece of stage scenery originally at rest by pulling it horizontally with a force of 176 N. W
Diano4ka-milaya [45]

<u>Answer:</u>

Option (a)

<u>Explanation :</u>

A stage hand starts sliding a large piece of stage scenery originally at rest by pulling it horizontally with a force of 176 N.

Hence Force applied  \text { Fapplied }=176 \mathrm{N}

Force on piece of scenery \mathrm{F}_{\mathrm{g}}=490 \mathrm{N}

\Sigma \mathrm{F} \mathrm{y}=\mathrm{F} \mathrm{n}-\mathrm{Fg}=0

\mathrm{Fn}=\mathrm{Fg}

\mathrm{FS}_{\mathrm{max}}=\mathrm{F}_{\mathrm{applied}}

µk = \frac{\mathrm{Fs} \max }{\mathrm{Fn}}

=  \frac{\text { Fapplied }}{\mathrm{Fg}}

=\frac{176}{490} =0.36

coefficient of static friction is 0.36

6 0
4 years ago
A woman starts to swim directly across a 5.2-km-wide river. Her speed with respect to the water is 1.9 m/s. The river current ca
elena-14-01-66 [18.8K]

Answer:

(a) the time needs for her to cross the river is 2736.8 s.

(b) the distance takes to reach the other side of the river is 2490.5 m.

Explanation:

given information:

woman's speed, v₁ = 1.9 m/s

the wide of river, s = 5.2 km = 5200 m

river's current, v₂ = 0.91 m/s

(a) How much time does it take her to cross the river?

s = v t

s = the displacement (m)

v = speed (m/s)

t = time (s)

s = v t

t = s/v

 = 5200/1.9

 = 2736.8 s

(b) How far downstream will the river carry her by the time she reaches the other side of the river?

s = v t

  = (0.91) (2736.8)

  = 2490.5 m

8 0
3 years ago
You're driving down the highway late one night at 21 m/s when a deer steps onto the road 35 m in front of you. Your reaction tim
andreev551 [17]

Speed with which initially car is moving is 21 m/s

Reaction time = 0.50 s

distance traveled in the reaction time d = v t

d = 21 * 0.50 = 10.5 m

deceleration after this time = -10 m/s^2

now the distance traveled by the car after applying bakes

v_f^2 - v_i^2 = 2a d

0 - 21^2 = 2(-10)d

d = 22.05 m

so total distance moved before it stop

d = 22.05 + 10.5 = 32.55 m

so the distance from deer is 35 - 32.55 = 2.45 m

now to find the maximum speed with we can move we will assume that we will just touch the deer when we stop

so our distance after brakes are applied is d = 35 - 10.5 = 24.5 m

again by kinematics

v_f^2 - v_i^2 = 2 ad

0 - v^2 = 2(-10)(24.5)

v = 22.1 m/s

so maximum speed would be 22.1 m/s

5 0
3 years ago
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