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3 years ago

30points, brainliest. Electrostatics Assignment very easy, need ASAP. 1-2

Physics

1 answer:

Lerok [7]3 years ago

4 0

1b) the atom could lose its valence electron

c) protons are equal to electrons so there is no need to include it

d) the atom would need to gain electrons to fill its valence shell to become negative

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Which statements in dalton's original atomic theory are now considered to be incorrect? describe how modern atomic theory differ

Illusion [34]

Incorrect statement in Dalton's original atomic theory are that atoms are indestructible and statement that all atoms of one element are same mass and characteristics.
Modern atomic theory is, of course, a little bit updated but original Daltons's theory is still remains. By modern atomic theory atoms can be destructed by nuclear reaction, but no with chemical reaction. Also there are different kinds of atoms in one element, their mass can be different.

3 0

3 years ago

A 1200 kg car reaches the top of a 100 m high hill at A with a speed vA. What is the value of vA that will allow the car to coas

SVEN [57.7K]

Answer:

the value of vA that will allow the car to coast in neutral so as to just reach the top of the 150 m high hill at B with vB = 0 is 31.3 m/s

Explanation:

given information

car's mass, m = 1200 kg

$h_{A}$ = 100 m

$v_{A}$ = $v_{A}$

$h_{B}$ = 150 m

$v_{B}$ = 0

according to conservative energy

the distance from point A to B, h = 150 m - 100 m = 50 m

the initial speed $v_{A}$

final speed $v_{B}$ = 0

thus,

$v_{B}$ ² = $v_{A}$ ² - 2 g h

0 = $v_{A}$ ² - 2 g h

$v_{A}$ ² = 2 g h

$v_{A}$ = √2 g h

= √2 (9.8) (50)

= 31.3 m/s

8 0

3 years ago

Take one jar with salt water and another with pure water .put an egg into both jars. In which the jar egg floated over the liqui

DanielleElmas [232]

Answer:

if the which coduct salt has more density so the egg floats .

Explanation:

8 0

3 years ago

A magnetic field is formed when electric charges move. When the electric charges stop moving, the magnetic field (which was form

Natali5045456 [20]

True

Explanation:

when electrons stop.moving it cause a stoppage

in formation of magnetic field

i hope.it helps u

7 0

3 years ago

A block with a mass of 31.8 kg is pushed on a frictionless

OlgaM077 [116]

Answer: Total work done on the block is 3670.5 Joules.

Step by step:

Work done:

$W = F.d.\cos\theta$

With F the force, d the displacement, and theta the angle of action (which is 0 since the block is pushed along the direction of displacement, and cos 0 = 1)

$W = F.d$

Given:

F = 75 N

m = 31.8 kg

Final velocity $v_f = 15.3 \frac{m}{s}$

In order to calculate the Work we need to determine the displacement, or distance the block travels. We can use the information about F and m to first figure out the acceleration:

$F = ma\\\implies a=\frac{F}{m}=\frac{75 N }{31.8 kg}\approx 2.36 \frac{m}{s^2}\\$

Now we can determine the displacement from the following formula:

$d = \frac{1}{2}a^2+v_0t+d_0$

Here, the initial displacement is 0 and initial velocity is also 0 (at rest):

$d = \frac{1}{2}at^2\\$

Now we still have "t" as unknown. But we are given one more bit of information from which this can be determined:

$v_f = a\cdot t_f\\\implies t_f = \frac{v_f}{a} = \frac{15.2 \frac{m}{s}}{2.36 \frac{m}{s^2}}\approx 6.44 s$

(using vf as final velocity, and tf as final time)

So it takes about 6.44 seconds for the block to move. This allows us to finally calculate the displacement:

$d = \frac{1}{2}at^2=\frac{1}{2}2.36 \frac{m}{s^2}\cdot 6.44^2 s^2 \approx 48.94 m$

and the corresponding work:

$W = F\cdot d=75 N\cdot 48.94 m =3670.5J$

7 0

3 years ago