PHYSICS HIGH SCHOOL

A boy kicks a ball with a mass of 5 kg so that it accelerates at 4 m/s2 in the forward direction. A 40 N
B 0 N
C 20 N backward
D 20 N forward

Answers

Answer 1
Answer: I think it should be D

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A universal law is a principle that is in effect everywhere at all times. Which example is likely to be a universal law? A. the force of attraction between two objects B. the model of the atom C. objects with like charges attract D. the theory of the atom

Physics question WILL GIVE BRAINLIEST!!! A 1,600 kg train car rolling freely on level track at 16 m/s bumps into a 1.0 x 10^3 kg train car moving at 10.0 m/s in the same direction, and the two latch onto each other and continue together. What is their final speed?10 m/s
14 m/s
6.0 m/s
16 m/s

Answers

Answer:

v'\approx 14\ m/s

Explanation:

Linear Momentum

Two objects of masses and moving in a linear path at speeds and respectively have a total momentum of

p=m_1v_1+m_2v_2

When the objects collide, a change of conditions occurs and they start to move at different speeds. The necessary condition to find the after-colliding speeds is the conservation of linear momentum that states the total momentum of an isolated system doesn't change regardless of the internal interactions of the objects. Thus, the new momentum is

p'=m_1v_1'+m_2v_2'

And they must be the same, thus

m_1v_1'+m_2v_2'=m_1v_1+m_2v_2

We know both cars stick together after the collision, so the final speed is common to both, and the above formula becomes

(m_1+m_2)v'=m_1v_1+m_2v_2

Solving for v'

\displaystyle v'=(m_1v_1+m_2v_2)/((m_1+m_2))

Plugging in the values, we have

\displaystyle v'=((1600)(16)+(1000)(10))/((1600+1000))

\boxed{v'=13.69\ m/s}

Correct option (closest to the computed speed): 14 m/s

If an object 18 millimeters high is placed 12 millimeters from a diverging lens and the image is formed 4 millimeters in front of the lens, what is the height of the image? A. 6 millimeters
B. 8 millimeters
C. 14 millimeters
D. 22 millimeters

Answers

The correct answer is letter A. 6 millimeters. If an object 18 millimeters high is placed 12 millimeters from a diverging lens and the image is formed 4 millimeters in front of the lens, the height of the image is 6 millimeters.

Solution:
18 / x = 12 / 4 
12x = 72
x = 6mm

Sa se calculeze caldura degajata de un fier de calcat dace este alimentat la 220v si este parcurs de un curent electric de 100 a. Se stie ca acesta functioneaza 25 de min

Answers

Answer

33,000,000 joules or 33MJ

Explanation:

The formula for calculating the heat released by a substance is expressed as shown below;

where;

Q is the amount of heat released

p is the power expended

t is the time it takes

Since P = current * voltage\nP = IV

Then;

Q = IVt

Given the current I = 100A, supply voltage V = 220V and required time t = 25mins

t = 25 * 60 = 1500 seconds

Substituting these values ​​in the formula that we have;

Q = 100 * 220 * 1500\nQ = 22000*1500\nQ = 33,000,000Joules\ or\ 33MJ

A 360-N child is in a swing that is attached to a pair of ropes 1.90 m long. Find the gravitational potential energy of the child–Earth system relative to the child's lowest position at the following times.

Answers

Answer:

684J

Explanation:

So basically the formula for gravitational potential energy is Mass X Gravity X height. That is G.p.e = mgh

We don't have the mass but since we have the height, we multiply directly with the height since the quantity of weight is already given.

so G.p.e = 360 X 1.9 = 684J

Note that; The answer is in joules because g.p.e is work done.

Hope that was helpful!!

Earth, the Sun, and billions of stars are contained within

Answers

I think it is the Milky Way.
In the Milky Way galaxy

The equation for the chemical reaction shown is not balanced. What number should replace the question mark to balance this equation?2KBr + ?Pb(NO3)2 → 2KNO3+ PbBr2

A.
The equation is balanced as is.

B.
A 6 is required.

C.
A 3 is required.

D.
A 2 is required.

Answers

The equation is balanced as it is.
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