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Physics
Physics
High School
a 45-cm -long, 65 g rod rotates about an axle at one end of the rod. at what angular velocity, in rpm , does the rod have 50 mj of rotational kinetic energy?
Physics
High School
Through which material do sound waves tend to move the most quickly
Physics
High School
what do we mean by accretion in the context of planet formation? group of answer choices the solidification of ices, rocks, and metal from the gas of the solar nebula the formation of moons around planets the growth of planetesimals from smaller solid particles that collided and stuck together the growth of the sun as the density of gas increased in the center of the solar nebula
Physics
High School
what is the wavelength in meters of an electron (mass *9.11 * 10-28 g) that has been accelerated to a speed of2.1 * 107 m>s?
Physics
High School
the box weighing 18 newtons is coated with teflon and now requires a force of 3 newtons to drag it.the coefficient of friction is .
Physics
High School
a spring gun shoots out a plastic ball at speed v. the spring is then compressed twice the distance it was on the first shot. by what factor is the ball's speed increased?
Physics
High School
a simple generator has a 440-loop square coil 22 cm on a side. how fast must it turn in a 0.55 t field to produce 120-v peak output?
Physics
High School
A pendulum on a grandfather clockis supposed to oscillate once every2. 00 s, but actually oscillates onceevery 1. 99 s. How much must youincrease its length to correct itsperiod to 2. 00 s?(Unit = m)
Physics
High School
suppose the horns of all cars emitted sound at the same pitch or frequency. what would be the change in the frequency of the horn of a car moving toward ou? away from you?
Physics
High School
the geocentric model of the universe that was widely accepted in scientific and religious circles until the 16th century was that of
Physics
High School
question 34 pts how do ambient sounds differ from sound effects?how are foley sounds different from sound effects?
Physics
High School
what would be the met-min per week if a 70 kg person is walking/jogging for 60 minutes per day, 3 days per week at the intensity of 6 mets?
Physics
College
Three masses hang about a meter stick whose fulcrum is at 20cm. A mass of m1=40.0 kg hangs at the 70.0 cm mark, m2= 30.0 kg hangs at the 30.0 cm mark and mass m3 = 20kg is located at the 50 cm mark. The mass of a metal washer, mw is hanging from the 15cm mark.a) Find the mass of the metal washer, mw needed to obtain static equilibrium.b) If the mass in part A is not realistic, then draw a diagram that will render a reasonable value. c) Complete the problem again when the fulcrum is located at the 50 cm mark.d) Repeat the problem above when the pivot point(axis of rotation) is located at the 60 cm mark of the meter stick.
Physics
High School
After a person has made a change in their life, relapse is common.A. TrueB. False
Physics
High School
If you view a rainbow out your window while riding in a train, youll see thatA) the rainbow can only be seen while youre moving slowly or at rest.B) the rainbow moves along with you.C) you soon pass by it, leaving it where you first saw it.
Physics
High School
can you hold your breath for one minute? even if you wanted to hold it longer, why can you not voluntarily do it?
Physics
High School
what is the ultimate fate of an isolated pulsar? it will spin ever faster, becoming a millisecond pulsar. as gravity overwhelms the neutron degeneracy pressure, it will become a white dwarf. as gravity overwhelms the neutron degeneracy pressure, it will explode as a supernova. it will slow down, the magnetic field will weaken, and it will become invisible. the neutron degeneracy pressure will eventually overwhelm gravity and the pulsar will slowly evaporate.
Physics
High School
what is an expression for x1(t) , the position of mass i as a function of time? assume that the position is measured in meters and time is measured in seconds.
Physics
High School
a balloon will stick to a wooden wall if the balloon is charged negatively. positively. either positively or negatively. none of the above choices are correct.
Physics
High School
find the magnitude of a uniform electric field (in mv/m) with the same energy density as a 0.23-t magnetic field.
Physics
College
juggler tosses a ball in air. The ball leaves the juggler's hand 4 feet above the ground and has an initial vertical velocity of 40 feet per second. The juggler catches the ball when it falls back to a height of 3 feet. How long is ball in air?
Physics
High School
at a given instant in time, an 8-kg rock that has been dropped from a high cliff, experiences an upward force of air resistance of 12 n.note: this is a multi-part question. once an answer is submitted, you will be unable to return to this part.what is the gravitational force on the rock? use g
Physics
College
the drawing shows a mercury barometer. consider two barometers, one using mercury and another using an unknown liquid. suppose that the pressure above the liquid in each tube is negligible. the height of the unknown liquid is 13.6 times greater than the height of the mercury. find the density of the unknown liquid.
Physics
High School
a ball whose mass is 0.3 kg hits the floor with a speed of 6 m/s and rebounds upward with a speed of 5 m/s. if the ball was in contact with the floor for 2 ms (2multiply10-3 s), what was the average magnitude of the force exerted on the ball by the floor?
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