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Physics
Physics
High School
An electric dipole with its center located at the origin of a Cartesian coordinate system oscillates along the x axis, creating an electromagnetic wave.a. At a position on the z axis far from the origin, what is the polarization of the wave?b. At a position on the axis far from the origin, what is the polarization of the wave?
Physics
High School
There is strong evidence that Europa, a satellite of Jupiter, has a liquid ocean beneath its icy surface. Many scientists think we should land a vehicle there to search for life. Before launching it, we would want to test such a lander under the gravity conditions at the surface of Europa. One way to do this is to put the lander at the end of a rotating arm in an orbiting earth satellite. If the arm is 4.25 m long and pivots about one end, at what angular speed (in rpm) should it spin so that the acceleration of the lander is the same as the acceleration due to gravity at the surface of Europa? The mass of Europa is 4.80 x 10^{22} kg and its diameter is 3120 km.
Physics
High School
a container in the form of a right circular cone (vertex down) has radius 4 m and height 16 m. see the figure. if water is poured into the container at the constant rate of 16 m3/min, how fast is the water level rising when the water is 8 m deep?
Physics
High School
a galaxy with thin spiral arms and a small spherical central bulge would be a type
Physics
High School
When an object's momentum changes, usually that means its velocity has charged. What must happer foan object's velocity to change?a. Its mass increasesb. An outside force acts upon itc. Its mass decreasesd. Its momentum must stay the same
Physics
College
a few objects with the same mass and radius are rotating around axes through their centers. which of these objects would be the easiest to stop from rotating?
Physics
High School
a star has a distance of 30 parsecs and a apparent magnitude of 3 --what would its absolute magnitude be?
Physics
High School
Which theory states that the universe originated as a single mass?
Physics
High School
Avanti works in a bookstore. She has four books and is going to place them in two stacks. The diagram above shows the books before they touch. Use the information in the diagram to answer the question.How did the temperatures of the four books compare before they touched? How will the temperatures of the two top books compare after the books have been touching for a while, and why?
Physics
High School
A 6. 0-m wire with a mass of 50 g, is under tension. A transverse wave, for which the frequency is 810 hz, the wavelength is 0. 40 m, and the amplitude is 4. 0 mm, is propagating on the wire. The time for a crest of this wave to travel the length of the wire is closest to.
Physics
High School
an object is released from a stationary hot balloon at height h above the ground. an identical object is released at height h above the ground from another balloon that us rising at constant speed. air resistance is negligible. what does not increase for the object released from the rising balloon?
Physics
College
In a hydraulic press the large piston has cross-sectional area 230 cm2 and the small piston has cross-sectional area 5 cm2. If a force of 250 N is applied to the small piston, what is the force (in kN) on the large piston? Give the answer with one decimal an no unit.
Physics
College
Suppose your bicycle tire is fully inflated, with an absolute pressure 4.00 x 10^5 Pa at a temperature of 15.0 C. What is the pressure after its temperature has risen to 40.0 C? Assume that there are no appreciable leaks or changes in volume.
Physics
High School
if the magnitude of the magnetic field is now decreased at a rate of -0.16 t/s , what force (magnitude and direction) will act on q ?
Physics
High School
When the spring is stretched and the distanced from point A to point B is 5.2 feet, what is the valuue of 0 to the nearest tenth of a degree?
Physics
College
Energy stored as a result of deformation of an elastic objectA.Thermal EnergyB.Chemical Potential EnergyC.Elastic Potential EnergyD.Energy Transfer
Physics
High School
communications satellites would fly off in a straight line never to be see again if it were not for a force from the earth compelling them to constantly change their direction. this tendency to fly off in a straight line is a statement of the
Physics
High School
an intergalactic spaceship arrives at a distant planet that rotates on its axis with a period of t. the spaceship enters a geosynchronous orbit at a distance of r.
Physics
High School
QuestionsQ1.A teacher takes a group of students on to a sports field to measure the speed of sound in air.The teacher fires a starting pistol.It produces a loud bang and a flash of light at the same time.The students take measurements.Describe how the measurements are made and used to determine the speed of sound in air.
Physics
High School
an object is located midway between the focal point and the center of a concave spherical mirror. draw a ray diagram to locate its image. is the image real or virtual, erect or inverted, magnified or reduced in size?
Physics
High School
since the observer does not interact with the subject in observation studies, observation is an error-free method of data collection question 2 options:
Physics
High School
an electron and a 0.0320-kg bullet each have a velocity of magnitude 510 m/s, accurate to within 0.0100%. within what lower limit could we determine the position of each object along the direction of the velocity?electron mmbullet m
Physics
High School
primary producers are present in every biome, including the deep sea. how can primary producers exist in the deep sea when sunlight does not penetrate to these depths?
Physics
High School
Which of the following is(are) true of globular clusters?A. They are smaller groups of stars orbiting larger galaxies.B. The stars in them are all of roughly the same age.C. Both a and b are correct.
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