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Physics
High School
which of the following is contact forcea)magnetic forceb)frictionc)gravityd electrical force
Physics
College
Pendulum clock. Your friend is trying to construct a clock for a craft show and asks you for some advice. She has decided to construct the clock with a pendulum. The pendulum will be a very thin, very light wooden bar with a thin, but heavy, brass ring fastened to one end. The length of the rod is 80 cm and the diameter of the ring is 10 cm. She is planning to drill a hole in the bar to place the axis of rotation 15 cm from one end. She wants you to tell her the period of this pendulum.
Physics
Middle School
Cabbage juice can be used as a pH indicator. Using the above chart, choose all of the statements that are correct
Physics
Middle School
When tectonic plates are strained to the point that they can no longer bend, which of the following is most likely to occur?A. EarthquakeB. Volcanic EruptionC. Convection CurrentD. Ocean Basin Formation
Physics
Middle School
A concave mirror forms a real image at 15.0 cm from the mirror surface along the principal axis. If the corresponding object is at a distance of 30.0 cm, what is the mirror's focal length? Please show your work
Physics
Middle School
How does increasing the distance between charged objects affect the electric force between them?OOOOThe electric force increases because the distance has an indirect relationship to the force.The electric force increases because the distance has a direct relationship to the force.The electric force decreases because the distance has an indirect relationship to the force.The electric force decreases because the distance has a direct relationship to the force.
Physics
High School
You arrive in science class 45 seconds after leaving math which is 90 meters to the south. What is your velocity?
Physics
College
When the early universe cooled enough for atoms to form, _____ began.A.dark energyB.the Big BangC.nucleosynthesisD.the cosmic microwave background radiation
Physics
College
CannonMass - MMarbleMass mNote: Figure not drawn to scale.Students launch identical marbles of mass mm horizontally from a toy cannon of mass MC,where Mc > mm, as shown above. The cannon can be adjusted to change the launch speed v ofthe marble relative to the ground. Each time a marble is launched, the cannon slides backwardbefore coming to rest. The coefficient of kinetic friction between the cannon and the ground is u(mu). For each launch, the students vary the launch speed v and record the distance x the cannonslides backward for each launch speed.
Physics
Middle School
What needs to be the relation between the two forces to cause the upper magnet to float without moving?
Physics
College
A firearms company is testing a new model of rifle by firing a 7.50-g lead bullet into a block of wood having a mass of 17.5 kg. The bullet embeds into the block and the collision generates heat. As a consequence, the temperature rises by 0.040C, as measured with a high-precision thermometer. Assuming that all the kinetic energy of the bullet goes into heating the system, what is the bullets speed when it enters the block? The initial temperatures of bullet and wooden block can be considered identical and the specific heats of lead and wood are cPb = 130 J/(kg C) and c wood = 1700 J/(kg C), respectively.
Physics
College
What is the motion of the particles in this kind of wave? A hand holds the left end of a set of waves. The waves themselves make a larger set of waves in the same direction as that of the smaller waves. A label Wave motion is above the series of waves and an arrow next to the label points right. The particles will move up and down over large areas. The particles will move up and down over small areas. The particles will move side to side over small areas. The particles will move side to side over large areas.
Physics
College
Problem 2: A flat belt is used with a driving pulley (diameter 4 inches) and a driven pulley (diameter 18 inches) in a open configuration. The center distance between the pulleys is 48 inches. The friction coefficient between the belt and pulley is 0.6. Determine the following: a) If the belt is initially tensioned to 50 lbs, what is the force in the belt on the tight side just before slippage (neglect the centrifugal force of the belt). b) Find the maximum torque required at the driving pulley.
Physics
College
Which of these parameters is directly related to sound frequency?
Physics
College
Photons of light scatter off molecules, and the distance you can see through a gas is proportional to the mean free path of photons through the gas. Photons are not gas molecules, so the mean free path of a photon is not equal to that of a molecule, but its dependence on the number density of the gas and on molecular radius is the same. Suppose you are in a smoggy city and can barely see buildings 500 m away. (a) How far would you be able to see if all the molecules around you suddenly doubled in volume? (b) How far would you be able to see if the temperature suddenly rose from 20C to a blazing hot 1500C with the pressure unchanged?
Physics
Middle School
What is true of both gravity and magnetism?Both are dependent on mass.Both forces can act without objects touching.Both forces are directly proportional to the distance between the objects.Neither is a fundamental force of nature.
Physics
High School
Una barra de longitud de 2 m est cargada uniformemente y tiene una carga total de 5nC. Busqu su potencial elctrico (relativo acero en el infinito) en un punto que se encuentra a lo largo del eje de la barra y est a 3m del centro de la barra?
Physics
College
Which term defines the distance from crest to crest
Physics
College
a) When we were examining the Electromagnetic Tab, we saw that a flow of electrons or a current as we say it, creates a magnetic field. What about the converse, can a magnetic field be involved in the creation of a flow of electrons/current? Therefore is it reasonable to suggest that we can create a magnetic field by having a flow of current and this can be used to make more current? Explain how this can occur
Physics
Middle School
Write the formula for kinetic energy that uses force in its equation. Calculate the kinetic energy generated when a 2500 N force is applied to a car when moving it 200 m. Show work.
Physics
High School
Select the correct answer.The motion of a car on a position-time graph is represented with a horizontal line. What does this indicate about the car's motion?.It's not movingB.It's moving at a constant speed.It's moving at a constant velocityD. It's speeding up.
Physics
High School
At a grocery store, 20 fl oz of brand A vitaminwater is sold for $0.95. What is the unit price ofthe vitamin water per ounce, to the nearest cents?
Physics
Middle School
The distance from the maximum disturbance to the undisturbed position is the____ of a wave
Physics
High School
- Un automvil parte del reposo y acelera uniformemente hasta alcanzar una rapidez de 0,255km/h en un tiempo determinado de 3/4 min. Determinar su aceleracin y la distancia recorrida.
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