Calculate how long it takes for a stone falling from a bridge with an average acceleration downward of 9.8m/s^2 to hit the water. The stone starts from rest and hits the water with a velocity of 12.3m/s.

Answers

Answer 1

Answer:
If the stone begins from rest and ends with a downward speed
of 12.3 m/s, then it must have spent

(12.3) / (9.8) = 1.26 seconds
falling.

Related Questions

Gold at 100.0°C is placed in 2.00×10^2 g of water at 20.0°C. The mixture reaches equilibrium at 21.2°C. the specific heat of gold is 0.129 (J/g°C) What is the mass of the gold? Specific heat of water is 4.18 (J/g°C) .
a stone is dropped from the top of 50 m high tower simultaneously another stone is thrown upward with a speed of 20 m/s . calculate the time at which both the stones cross each other
Which statement(s) correctly compare the masses of protons, neutrons, and electrons?
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.
All of the following are examples of ways to improve energy efficiency of heating systems, except _______.A. Closing off rooms that aren’t in use. B. Frequently cleaning the furnace filter. C. Fixing cracks in the walls and floor. D. Opening the front door in winter to filter and clean warm air.

A spring is stretched 0.75 m by using a force of 30 N. What is the spring constant

Answers

Hi there!

40 N/m

We can use Hooke's Law:

F = kx or F = -kx

F = force (N)

k = Spring constant (N/m)

x = displacement (m)

We are given the force and displacement, so:

F/x = k

30/0.75 = 40 N/m

A cube of side 3.56 cm has a charge of 9.11 μ C placed at its center. Calculate the electric flux through one side of the cube

Answers

Answer:

$\phi_(surface) = 1.72 * 10^5 N/Cm^2$

Explanation:

As we know by the theory of flux that if charge "q" is enclosed in a closed surface then total flux through the surface is given as

$\phi = (q)/(\epsilon_0)$

so here total flux passing through the cube is given as

$\phi_(total) = (9.11\muC)/(8.85 * 10^(-12))$

now we will have

$\phi_(total) = 1.03* 10^6$

now as we know that charge is placed at the center of the cube

so the total flux is uniformly passing through all faces of the cube

so flux passing one side of the cube is given as

$\phi_(surface) = (1.03* 10^6)/(6)$

$\phi_(surface) = 1.72 * 10^5 N/Cm^2$

Flux=q/e0
e0=8.85*10^-12
!!! Cube has 6 sides, so flux through one side is equal to total flux/6
Ans=9.11*10^(-6)/((8.85*10(-12))*6)=(approximately)1.72*10^5Nm^2/C

Within an internal combustion engine, the can-shaped component that moves up and down the cylinder and is the main moving part in the engine is the A. connecting rod.
B. crankshaft.
C. piston.
D. spark plug.

Answers

Answer;

C. piston.

Explanation;

A piston is a cylindrical component of the engine that slides back and forth in the cylinder bore by forces produced during the combustion process. It is the can shaped engine component that moves up and down the cylinder and is the main moving part of an engine.
It acts as a movable end of the combustion chamber. Pistons are made of cast aluminium alloy to allow excellent and light weight thermal conductivity. They consists of a piston head, piston pin bore, piston pin, skirt piston rings, ring grooves and ring lands.

The crankshaft turns that moves the connecting rod up and down and the piston is inside the cylinder up and down movement.Answer piston

What is the difference between electric field and electrostatic field?

Answers

Semantically? An electric field does not have to be static while in electrostatics it's generally assumed that the electric field does not change or only changes so slowly that its rate of change doesn't matter. That's very different in electrodynamics where electric and magnetic field changes are always coupled.

The main difference is that Electrostatic field is because of a stationary charge. And Induced field is because of a changing magneticfield. Since magnetic field and electric field are the same thing in different frames of reference.

The Doppler effect suggests that sound waves are relative to the observer. You know if an object is coming or going from the sound it makes. Light waves follow the Doppler effect also. However, instead of sound changing, you know if an object is coming or going _____.

Answers

A similar principle is observed with light as it is with sound. If an object is moving away from you the wavelengths gets longer, and towards the red light spectrum of the visible light spectrum, whereas if an object is moving towards you the wavelength will decrease towards the blue end of the spectrum

Answer:

from the color of the light

Explanation:

1. In which medium does sound travel the fastest? a. salt water
b. fresh water
c. air
d. cast iron

2. A wave has a wavelength of 10 mm and a frequency of 5 hertz. What is its speed?
a. 50 mm/s
b. 50 hertz/s
c. 2 mm/s
d. 0.50 mm/s

3. How does reflection differ from refraction and diffraction?
a. Reflection is the only process in which the wave does not continue moving forward.
b. Reflection is the only process that involves a change in the wave.
c. Reflection affects all types of mechanical waves, but refraction and diffraction do not.

Answers

Answer : 1. cast iron

2. 50 mm/s

3. Reflection is the only process in which the wave does not continue moving forward.

Explanation :

1. The speed of sound is greatest in solid. So, the speed of the sound is fastest in cast iron. It is approximately equal to 4600 m/s.

2. Wavelength, λ = 10 mm

Frequency, υ = 5 Hz

Speed = wavelength × frequency

Speed = 10 mm × 5 s⁻¹

Speed, s = 50 mm/s

3. The bouncing back of light is called the reflection of light. In this process, the wave does not continue moving forward.

1- CAST IRON

2- 50 mm/s

3- Reflection is the only process in which the wave does not continue moving forward.

Other Questions

The study of celestial objects in the universe describes which field of physical science?a. Physics b. Chemistry c. Astronomy d. None of the above User: Scientific knowledge is

Scientists have found ancient rock formations dating to the late Proterozoic eon in South America. These ancient rocks can be found from the eastern edge of South America's continental shelf, which extends just off the coast of Brazil, to the interior of the continent. This general location is indicated by a green circle on the map below. Scientists have also found rock formations made out of the same type of rock and from the very same eon at another location. The location of this second group of rock formations strongly supports the current theory of plate tectonics. Where is the second rock formation most likely located?

In which type of wave do the particles in a medium move perpendicular to the direction that the wave moves? A.transverse waves B.ocean waves C.surface waves D.longitudinal waves

Europa, a satellite of Jupiter, is believed to have an ocean of liquid water (with the possibility of life) beneath its icy surface. Europa is 3130 km in diameter and has a mass of 4.78×10²² kg. In the future, we will surely want to send astronauts to investigate Europa.In planning such a future mission, what is the fastest that such an astronaut could walk on the surface of Europa if her legs are 0.960 m long?