PHYSICS HIGH SCHOOL

How do you find the pressure (in physics) if you are given the force (Newtons) and how far the object sunk into the ground?

Answers

Answer 1
Answer:

Answer:

pressure=force/area

Explanation:

pressure equal to force divided by area,the area is how far the object sunk into the ground

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The rings of Saturn occupy the region inside Saturn's Roche limit.

Answers

I suppose this is a true or false question and that sentence is true.

A 0.145-kg baseball pitched at 37.5 m/s is hit on a horizontal line drive straight back toward the pitcher at 57.0 m/s . If the contact time between bat and ball is 2.50×10−3 s , calculate the average force between the ball and bat during contact.

Answers

Answer:

The average force between the ball and bat during contact is 1131N.

Explanation:

The average force can be found employing Newton's second law:

F = ma (1)

Where F is the force, m is the mass and a is the acceleration.

The acceleration can be determined employing the equations for a Uniformly Accelerated Rectilinear Motion:

v_(f) = v_(i) + at  (2)

Where v_(f) is the final velocity, v_(i) is the initial velocity and t is the time.

Then, a will be isolated from equation 2:

a = (v_(f)-v_(i))/(t) (3)

Replacing equation (3) in equation (1) it is gotten:

F = m(v_(f)-v_(i))/(t)

F = (0.145Kg)((57.0m/s-37.5m/s))/((2.50x10^(−3)s))

F = (0.145Kg)((19.5m/s))/((2.50x10^(−3)s))

F = 1131Kg.m/s{2}

But 1N = 1Kg.m/s^(2), therefore:

F = 1131N

So, the average force between the ball and bat during contact is 1131N.

In a cathode ray tube, the number of electrons that reach the fluorescent screen is controlled by the A. cathode.
B. grid.
C. anode.
D. deflecting plate.

Answers

In a cathode ray tube, the number of electrons that reach the fluorescent screen is controlled by the grid. The correct option among all the options given in the question is option "B".When current issupplied to the heater, it causes the cathode to emit electrons. The electronspass through opening of the grid before reaching the anode. By controlling thenumber of electrons passing through the grid, the number of electrons reachingthe anode can also be controlled. 

Answer: B. GRID

Explanation: I JUST TOOK THE PF EXAM AND GOT IT CORRECT!!!!

Explain how DNA codes for traits

Answers

the genetic code dictates which proteins the cell manufacturer. proteins are strands of amino acids. the sequence of nucleotides in DNA genes determines the order of amino acids in a protein. this is the direct connection between your genes and your traits.

Select all of the following that describes momentum, p [mark all correct answers] a. momentum is the product of mass and acceleration
b. momentum is the product of mass and speed
c. momentum is the product of mass and velocity
d. momentum is a scalar quantity
e. momentum is a vector quantity
f. momentum has unit of newton (N)
g. momentum has unit of kgm/s
h. momentum has unit of kgm2/s2
i. momentum has unit of joule (J)
j. momentum is one-half the product of mass and the square of the object's speed

Answers

Answer:

c. Momentum is the product of mass and velocity

e. Momentum is a vector quantity

g. Momentum has unit of kgm/s

Explanation:

Linear momentum P

P = m .v

m =mass

v=Velocity

If mass take in kg and velocity is in m/s then momentum p will be in kg.m/s.

1. momentum is the product of velocity and mass.

2.Momentum is a vector quantity.

3.Momentum have kg.m/s unit.

So the following option are correct.

c. Momentum is the product of mass and velocity

e. Momentum is a vector quantity

g. Momentum has unit of kgm/s.

Note-

1.Joule is the unit of energy.

2.One-half the product of mass and the square of the object's speed is known as kinetic energy.

The ability of a material to transfer heat or electric current is calledA. conductivity.
B. insulation.
C. porosity.
D. convection.

Answers

the answer is conductivity
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