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3 years ago

How many electrons must be remowel from an electricaly Nurutral Silvor Coin to five it a charge of 3.2 NC ?

Physics

1 answer:

kakasveta [241]3 years ago

7 0

Answer:

#_electrons = 2 10¹⁰ electrons

Explanation:

For this exercise we can use a direct rule of three proportions rule. If an electron has a charge of 1.6 10⁻¹⁹ C how many electrons have a charge of 3.2 10⁻⁹ C

#_electrons = 3.2 10⁻⁹ ( $\frac{1}{1.6 \ 10^{-19}}$ )

#_electrons = 2 10¹⁰ electrons

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A swimmer, capable of swimming at a speed of 1.0 m/s in still water (i.e., the swimmer can swim with a speed of 1.0 m/s relative

Vesnalui [34]

If the current takes him downstream we must find the resultant vector of the velocities: $V res= \sqrt{1^{2}+0.91^{2} } = \sqrt{1.8281}= 1.3520747$ Then if the river is 3000 m-wide the swimmer will have to pass:
1.3520747 · 300 = 4056.14 m t = 4056.14 m : 1 m/s
a ) It takes 4056.15 seconds ( 1 hour 7 minutes and 36 seconds ) to cross the river.
b ) 0.91 · 3000 = 2730 m
He will be 2730 m downstream.

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3 years ago

Not a question but need a lot of tips

skad [1K]

DibujaZos da buenos tips e incluso el pinta con colores faber castel son económicos y el dibujo queda epico

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3 years ago

Pls match this I will mark u as brainlist ans

Tasya [4]

Answer: The items listed in the attached file is correctly matched below.

Explanation:

51.) Temperature --> ( Kelvin). This is the correct option as the standard international unit of temperature is measured in Kelvin.

52.) Needle --> ( wedge). An example of a wedge is a needle as they are simple machine designed to make work easier.

53.) Wood --> ( non - magnetic material). This is the correct option as wood can not be attracted by a magnet.

54.) Door knob--> (wheel and axle). The door knob is a type of wheel and axle as it has a wheel portion which is the knob and an axle which is the rod in the door that turns the same axis.

55.) Ramp --> (inclined plane). A ramp is an inclined plane which has a sloping surface.

56.) Like forces --> (repels each other). In an electrostatic field, two charged objects repels each other if they have like forces.

57.) Mass --> ( kilogram). This is the correct option as the standard international unit of mass is measured in kilogram.

58.) Friction --> ( oppose motion). This is correct as friction is the force that poses resistance to a moving object.

59.) Cobalt coin -->( magnetic material). This is the correct option as cobalt coin can be attracted by a magnet.

60.) Lemon crusher --> ( Class 2 lever). This is correct as the lemon (load) is at the middle of the fulcrum ( squeezer) and the effort (hand)

61.) Sew saw -->( Class 1 lever). This is correct as in first class lever type of machine, the fulcrum is in-between the load and the effort.

62.) Wheel and axle --> ( Grooved wheel with rope around)

63.) Unlike forces --> ( attracts each other). In an electrostatic field, two charged objects attracts each other if they have unlike forces ( that is, one is positive and the other is negative).

64.) Earth pulls everything towards --> (Gravitational force). This is correct as stated by Newton's law of universal gravitation. This law states that every massive particle in the universe attracts every other massive particle with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.

65.) Wedge --> (Device to split object apart). This is correct as wedge is a type of simple machine which is used to split objects apart.

6 0

3 years ago

Read 2 more answers

Striking a fixed object at 60 MPH is the same as falling from a _____ story building:

yulyashka [42]

speed of the striking object is given as

$v = 60 mph$

now this speed in SI units given as

$v = 60 \times \frac{1609 m}{3600 s}$

$v = 26.82 m/s$

So here we can use kinematic now to find the height from where it is dropped

so here we will have

$v_f^2 - v_i^2 = 2 a d$

now we have

$v_f = 26.82 m/s$

$v_i = 0$

$a = 9.81 m/s^2$

now from above equation

$26.82^2 - 0 = 2(9.81)d$

$d = 36.67 m$

now we know that average height of 1 story building is 3 meter

so approx total number of stories in the building will be

$N = \frac{36.67}{3} = 12 story$

6 0

3 years ago

Read 2 more answers

A 15.0 kg bucket is lowered vertically by a rope in which there is 188 N of tension at a given instant

saw5 [17]

Answer: 2.72 m/s²

Explanation:

F = m(g + a)

188 = 15.0(9.81 + a)

188 = 147.15 + 15.0a

40.85 = 15.0a

a = 2.7233333... ≈ 2.72 m/s²

This is an upward acceleration as the force being applied is greater than that needed to maintain constant velocity. (147 N)

So even though the bucket is being lowered, it's rate of descent is decreasing with time. If the acceleration continues for long enough, the bucket will begin to rise.

6 0

3 years ago