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4 years ago

How fast or slow an object is moving and in what direction

1 answer:

4 0

<span>A moving object can be described by its velocity. Velocity is how fast an object is moving. Known as speed AND in what direction. A plus or minus sign is often used as an indicator of direction. So an object with a velocity of -34 m/s is moving with a speed of 34 m/s in. the - direction.</span>

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Which object that attracts iron is?

Nutka1998 [239]

A magnet attracts iron

5 0

3 years ago

An electron of mass 9.11 1031 kg has an initial speed of 3.00 105 m/s. It travels in a straight line, and its speed increases to

elena55 [62]

Explanation:

It is given that,

Mass of an electron, $m=9.11\times 10^{-31}\ kg$

Initial speed of the electron, $u=3\times 10^5\ m/s$

Final speed of the electron, $v=7\times 10^5\ m/s$

Distance, d = 5 cm = 0.05 m

(a) The acceleration of the electron is calculated using the third equation of motion as :

$a=\dfrac{v^2-u^2}{2d}$

$a=\dfrac{(7\times 10^5)^2-(3\times 10^5)^2}{2\times 0.05}$

$a=4\times 10^{12}\ m/s^2$

Force exerted on the electron is given by :

$F=m\times a$

$F=9.11\times 10^{-31}\times 4\times 10^{12}$

$F=3.64\times 10^{-18}\ N$

(b) Let W is the weight of the electron. It can be calculated as :

$W=mg$

$W=9.11\times 10^{-31}\times 9.8$

$W=8.92\times 10^{-30}\ N$

Comparison,

$\dfrac{F}{W}=\dfrac{3.64\times 10^{-18}}{8.92\times 10^{-30}}$

$\dfrac{F}{W}=4.08\times 10^{11}$

Hence, this is the required solution.

8 0

4 years ago

After three times the particle half-life of radioactive particle, 1/4 of the particle will remain un-decayed. O True O False

Roman55 [17]

Answer:

False

Explanation:

Let the initial amount is No.

Let t be the half life.

Half life is the time in which the initial amount of the substance becomes half and the remaining amount in teh sample is also half.

After one half life, the remaining amount is No / 2

After two half lives, the remaining amount is No / 4

After three half lives, the remaining amount is No / 8.

So, the statement is false.

6 0

4 years ago

Determine the value of n so that the vectors A and B are perpendicular: Ā = î + 5j + nk and B = 2î - j + k

Tanya [424]

If $\vec A$ and $\vec B$ are perpendicular, then their dot product is zero. This means

$\vec A \cdot \vec B = (\vec\imath + 5\,\vec\jmath + n\,\vec k) \cdot (2\,\vec\imath - \vec\jmath + \vec k) = 2 - 5 + n = 0$

Solving for n is trivial; it follows that n = 3.

6 0

2 years ago

The circuit contains a filament bulb, connected with ........ to a ........

Katyanochek1 [597]

Answer:

The circuit contains a filament bulb, connected with terminal to a terminal.

Explanation:

The base of the electric bulb and the metal tip of the base are the two terminals of the bulb. One is called a positive terminal while the other is called a negative terminal. The filament of the electric bulb is connected to its terminals.

8 0

3 years ago