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3 years ago

F. Protons and neutrons

Physics

1 answer:

Readme [11.4K]3 years ago

3 0

Answer:

2. False :

An object that is positively charged has a greater positive charge and a lower negative charge.

3. Will be This :

Q.→ TRUE or FALSE: An object that is negatively charged could contain only electrons with <u>no</u> accompanying protons.

Answer → False :

Negatively charged objects have protons; it's just their number of electrons is greater than their number of protons.

4. False :

An object that is electrically neutral contains neutrons and the same number of unlike charges, i.e., electrons and protons.

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PLEASEEEE HEEEEELP!!!!!

8090 [49]

Answer:

Before:

$p_{truck}=16400\ kg.m/s$

$p_{car}=10000\ kg.m/s$

After:

$p_{truck}=8000\ kg.m/s$

$p_{car}=8400\ kg.m/s$

$v_{fcar}=8.4\ m/s$

$F=9333.33 \ Nw$

Explanation:

<u>Conservation of Momentum</u>

Two objects of masses m1 and m2 moving at speeds v1o and v2o respectively have a total momentum of

$p_1=m_1v_{1o}+m_2v_{2o}$

After the collision, they have speeds of v1f and v2f and the total momentum is

$p_2=m_1v_{1f}+m_2v_{2f}$

Impulse J is defined as

$J=F.t$

Where F is the average impact force and t is the time it lasted

Also, the impulse is equal to the change of momentum

$J=\Delta p$

As the total momentum is conserved:

$p_1=p_2$

$m_1v_{1o}+m_2v_{2o}=m_1v_{1f}+m_2v_{2f}$

We can compute the speed of the second object by solving the above equation for v2f

$\displaystyle v_{2f}=\frac{ m_1v_{1o}+m_2v_{2o} -m_1v_{1f} }{ m_2 }$

The given data is

$m_1=2000\ kg$

$m_2=1000\ kg\\v_{1o}=8.2\ m/s\\v_{2o}=0\ m/s\\v_{1f}=4\ m/s$

a) The impulse will be computed at the very end of the answer

b) Before the collision

$p_{truck}=2000\cdot 8.2=16400\ kg.m/s$

$p_{car}=1000\cdot 0=0\ kg.m/s$

c) After collision

$p_{truck}=2000\cdot 4=8000\ kg.m/s$

Compute the car's speed:

$\displaystyle v_{2f}=\frac{ 16400+0 -8000 }{ 1000 }$

$v_{2f}=8.4\ m/s$

And the car's momentum is

$p_{car}=1000\cdot 8.4=8400\ kg.m/s$

The Impulse J of the system is zero because the total momentum is conserved, i.e. \Delta p=0.

We can compute the impulse for each object

$J_1=\Delta p_1=2000(4-8.2)=-8400 \N.s$

The force can be computed as

$\displaystyle F=\frac{J}{t}=-\frac{8400}{0.9}=-9333.33 \ Nw$

The force on the car has the same magnitude and opposite sign

7 0

4 years ago

Isaac Newton's first law of motion states?

lesya [120]

Answer:

His first law states that every object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force. In other words its inertia.

Explanation:

8 0

3 years ago

At 19°C, a rod is exactly 19.11 cm long on a steel ruler. Both the rod and the ruler are placed in an oven at 280°C, where the r

Ratling [72]

Answer:

$\alpha = 4.12 \times 10^{-5} per Degree C$

Explanation:

As we know that when we increase the temperature of the rod and the ruler then in that case there will be change in the length of the both.

Due to this the ruler measurement is different from actual length of the rod

So by thermal expansion we know that

$L = L_o(1 +\alpha \Delta T)$

$L = 19.11 (1 + \alpha(280 - 19))$

$L = 19.11(1 + 261\alpha)$

Now for length of unit division of steel scale

$1 unit = 1( 1 + \alpha_s \Delta T)$

$1 unit = (1 + (11 \times 10^{-6})(280 - 19))$

$1 unit = 1.0029$

now the measured length from the scale is given as

$L_{measured} = \frac{L}{1.0029}$

$L_{measured} = \frac{19.11(1 + 261\alpha)}{1.0029}$

$19.26 = \frac{19.11(1 + 261\alpha)}{1.0029}$

$\alpha = 4.12 \times 10^{-5} per Degree C$

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3 years ago

When does a chemical indicator change?

S_A_V [24]

Chemical indicator, any substance that gives a visible sign, usually by a colour change, of the presence or absence of a threshold concentration of a chemical species, such as an acid or an alkali in a solution. An example is the substance called methyl yellow, which imparts a yellow colour to an alkaline solution.

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3 years ago

Water is poured slowly into the container until the water level has risen into tubes A, B, and C. The water doesn't overflow fro

d1i1m1o1n [39]

Answer:

dA = dB = dC

Explanation:

7 0

3 years ago