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2 years ago

Where is the acceleration zero?

Physics

1 answer:

ladessa [460]2 years ago

3 0

Answer:

When acceleration is zero (that is, a = dv/dt = 0), rate of change of velocity is zero. That is, acceleration is zero when the velocity of the object is constant. so probably D

Explanation:

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Two astronauts of mass 100 kg are 2 m apart in outer space. What is the

fredd [130]

The force of gravity between the astronauts is $1.67\cdot 10^{-7}N$

Explanation:

The magnitude of the gravitational force between two objects is given by:

$F=G\frac{m_1 m_2}{r^2}$

where :

$G=6.67\cdot 10^{-11} m^3 kg^{-1}s^{-2}$ is the gravitational constant

$m_1, m_2$ are the masses of the two objects

r is the separation between them

In this problem, we have two astronauts, whose masses are:

$m_1 = 100 kg\\m_2 = 100 kg$

While the separation between the astronauts is

r = 2 m

Substituting into the equation, we can find the gravitational force between the two astronauts:

$F=\frac{(6.67\cdot 10^{-11})(100)(100)}{2^2}=1.67\cdot 10^{-7}N$

Learn more about gravitational force:

brainly.com/question/1724648

brainly.com/question/12785992

#LearnwithBrainly

4 0

3 years ago

Read 2 more answers

Describe briefly with used of practical knowledge the effect of the voltage stores across and current

DaniilM [7]

Answer:

Answer in explanation

Explanation:

The path of flow of circuit is called electric circuit. In an electric circuit, resistances are connected in two different ways, which are:

1- Series Combination of Resistances

2- Parallel Combination of Resistances

<u>Series combination of resistances </u>

In series combination resistors are connected end to end, and there is only one path for the flow of current.

Characteristics Of Series Circuit:

1. In series circuit there is only one path for the flow of current.

2. Same amount of current flows through each resistor.

I = I₁ = I₂ = I₃ = In

3. Total voltage of the battery is equal to the sum of voltages across each resistor.

V = V₁ +V₂ + V₃ + ... + Vn

4. In series combination the combined resistance of the resistors can be obtained by adding the value of each resistor.

R = R₁ + R₂ + R₃ + … + Rn

<u>Parallel combination of resistances </u>

Resistances are set to be connected in parallel, when each of them is connected directly from the terminals of electric source.

Characteristics Of Series Circuit:

1. There are more than one path for the flow of current.

2. The value of potential difference remains constant on each resistor.

V = V₁ = V₂ = V₃ = Vn

3. Total current is equal to the sum of current passing through each resistor.

I = I₁ + I₂ + I₃ +...+ In

4. Reciprocal of equivalent resistance is equal to the sum of reciprocals of resistances connected in parallel.

1/R = 1/R₁ + 1/R₂ + 1/R₃ + … + 1/Rn

The circuit diagrams are in attachment.

7 0

3 years ago

(a) Compute the radius r of an impurity atom that will just fit into an FCC octahedral site in terms of the atomic radius R of t

ratelena [41]

Answer:

radius r is 0.414 R

Explanation:

Given data

FCC octahedral site

atomic radius R

to find out

radius r

solution

we know that at FCC octahedral

length of side = 2 R + 2r

and by pythagorean theorem

a = 2√2R

here a = 2R + 2r

so 2R + 2r = 2√2R

so r = ( √2R )- R

r = 0.414 R

so radius r is 0.414 R

5 0

3 years ago

Which statements describe characteristics of most metals? Check all that apply.

DerKrebs [107]

The answer is:

A. They can be formed into wires.

B.They are shiny.

D. They are good conductors

E.can be easily shaped by hammering or pounding.

The explanation:

Let's see the characteristics of the most metals:

1) the most metals can be hit by a hammer and form a thin sheets without breaking and this called malleability.

for example: Aluminium and copper

2) They can form into a very thin wires and this called ductility

for example: silvar , Aluminium and copper.

3) The metal can conduct the heat and the electricity very easy and quick, this mean that the meals are good conductor for the heat and electricity.

4)The metals like gold can be used at jewellery because it is very shiny.

5) and answer C is wrong because most metals are solid at room temperature.

6 0

3 years ago

Read 2 more answers

In an inelastic collision, cart A of mass 100kg is moving to the right at 10m/s toward cart B of mass 200kg which is at rest. Th

prohojiy [21]

Answer:

3.33 m/s to the right

Explanation:

Momentum is conserved, so you have ...

(m1·v1) +(m2·v2) = (m1+m2)v

v = (m1·v1 +m2·v2)/(m1+m2)

= ((100 kg)(10 m/s) +(200 kg)(0 m/s))/(100 kg +200 kg)

= (1/3)(10 m/s) ≈ 3.33 m/s

The final velocity is about 3.33 m/s to the right.

8 0

2 years ago

Read 2 more answers