PHYSICS
MIDDLE SCHOOL

Answer:

Answer:

The force needed will be 5000[N]

Explanation:

Using the Newton's second law we have:

MIDDLE SCHOOL

A neutron Star that spins is known as what

I think it is known as a pulsar!

I don't know if this is right but I hope this helps. This pulsar was later interpreted as an isolated, rotating neutron star. The energy source of the pulsar is the rotational energy of the neutron star. The majority of known neutron stars (about 2000, as of 2010) have been discovered as pulsars, emitting regular radio pulses.

MIDDLE SCHOOL

(Math Question) Angle A is a complement of Angle B and the midpoint of Angle A is 36 degrees. Find the midpoint of Angle B.

Complementary angles are those whose sum is 90 degrees, right?, then let's find A, A=72 degrees, because its mid point is 36 deg. Then, B = 18 degrees and its mid point is 9 degrees! :)

COLLEGE

An object's position in a given coordinate system is described by the vector r = t2 i - (3t + 3) j. Assume the object moves without air resistance. [email protected] 25% Part (a) What is the object's displacement between times t1 = 1 s and t2 = 3 s? Write your answer in component form. Δr = 8 i - 6 j ✔ Correct!

The object's displacement for the given time period is 8i - 6j

The given parameter:

t₁ = 1 s

t₂ = 3 s

To find:

- the displacement of the object between t₁ and t₂

When the time is 1 s, the position of the object is calculated as;

When the time is 3 s, the position of the object is calculated as;

The displacement of the object is calculated as;

Thus, the object's displacement for the given time period is 8i - 6j

Learn more here: brainly.com/question/9972743

Answer:

The object´s displacement vector is Δr = 8i - 6 j

Explanation:

Hi there!

The position vector is given by the following function:

r = t²i - (3t + 3) j

Let´s find the position of the object at time t1 and t2:

At t1 = 1 s:

r1 = (1)² i - (3 · (1) + 3 )j

r1 = 1 i - 6 j

At t2 = 3 s:

r2 = (3)² i - (3 · (3) + 3) j

r2 = 9 i - 12 j

The displacement is calculated as follows:

displacement = Δr = final position - initial position = r2 - r1

r2 - r1 = 9 i - 12 j - (1 i - 6 j)

r2 - r1 = 9 i - 12 j - 1 i + 6 j

r2 - r1 = 8 i - 6 j

The object´s displacement vector is Δr = 8i - 6 j

HIGH SCHOOL

Which of the following best describes the role of culture in the achievement of developmental milestones? Cultural influences may slow a child's progress but will not speed it up.

Cultural influences may speed up a child's progress but will not slow it down.

Children achieve developmental milestones at the same time regardless of culture.

Children achieve developmental milestones according to what is most valued in their culture.

Answer:

Children achieve development milestones at the same time regardless of culture

Explanation:

Answer:

Children achieve developmental milestones at the same time regardless of culture.

MIDDLE SCHOOL

The pH of your mouth is very similar to that of stomach. True or false?

Answer:

False

Explanation:

MIDDLE SCHOOL

What are the principles of electrodynamic

Answer:

the branch of mechanics concerned with the interaction of electric currents with magnetic fields or with other electric currents.

Explanation:

HIGH SCHOOL

A 0.27 kg rock is projected from the edge of the top of a building with an initial velocity of 11.7 m/s at an angle 58◦ above the horizontal. Due to gravity, the rock strikes the ground at a horizontal distance of 15.9 m from the base of the building.

Total height of the building =6.78 m

Calculation of building height:Horizontal component of velocity == 6.2 m/s

Now

Total time of flight

= Horizontal distance ÷ Horizontal component of velocity

= 15.9 ÷ 6.2

= 2.56 sec.

Now

Vertical component of velocity = = 9.92 m/s

Now

Time taken to reach maximum height = Vertical component of velocity ÷ g = 9.92 ÷ 9.81 = 1.01 sec.

So,

Time taken to reach ground from maximum height is

= 2.56 - 1.01

= 1.55 sec.

Now Maximum height from ground = 11.78 m

Now

Maximum height from the top of building = = 5 m

So

Total height of the building

= 11.78 m - 5 m

= 6.78 m

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Incomplete question.The complete question is

A 0.27 kg rock is projected from the edge of the top of a building with an initial velocity of 11.7 m/s at an angle 58 above the horizontal. Due to gravity, the rock strikes the ground at a horizontal distance of 15.9 m from the base of the building. How tall is the building? Assume the ground is level and that the side of the building is vertical. The acceleration of gravity is 9.8 m/s

Answer:

Total height of the building =6.78 m

Explanation:

v = 11.7 m/s

Horizontal component of velocity = v x cos 58 = 11.7*cos 58 = 6.2 m/s

Total time of flight = Horizontal distance / Horizontal component of velocity = 15.9 / 6.2 = 2.56 sec.

Vertical component of velocity = v x sin 58 = 11.7 x sin 58 = 9.92 m/s

Time taken to reach maximum height = Vertical component of velocity / g = 9.92 / 9.81 = 1.01 sec.

Hence, Time taken to reach ground from maximum height = 2.56 - 1.01 = 1.55 sec.

Hence, Maximum height from ground = 0.5 x g x t^2 = 0.5 x 9.81 x 1.55^2 = 11.78 m

Maximum height from the top of building = 0.5 x 9.81 x 1.01^2 = 5 m

Hence, Total height of the building = 11.78 m - 5 m = 6.78 m

HIGH SCHOOL

A 0.023 kg golf ball moving at 15.7 m/s crashes through the window of a house in 5.3 × 10−4 s. After the crash, the ball continues in the same direction with a speed of 11.4 m/s. Assuming the force exerted on the ball by the window was constant, what was the magnitude of this force? Answer in units of N.

Answer:

Magnitude of the force exerted on the window = 186.6 N

Explanation:

Impulse = change in momentum

Impulse = force × time period during which it acts = F × t = Ft

Change in momentum = m(v₁ - v₂)

m = 0.023 kg, v₁ = 15.7 m/s, v₂ = 11.4 m/s

Change in momentum = 0.023 (15.7 - 11.4) = 0.0989 kgm/s

Impulse = change in momentum = 0.0989

Ft = 0.0989

t = 5.3 × 10⁻⁴ s = 0.00053

F = 0.0989/0.00053 = 186.6 N

COLLEGE

If the work required to move a 0.35 c charge from point a to point b is 125 j, what is the potential difference between the two points?

The value of the potential difference given between these two points is 357 volts.

Given the following information, we have:

- the charge value is 0.35 c
- the work value is 125 j

Using the following formula we have:

Substituting the already known values, we have:

See more about potencial at brainly.com/question/2701710

Using W = qV => V = W/q