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Physics
Physics
High School
The total momentum of a system of two moving identical bodies is zero. What should be true about the velocities of the bodies?.
Physics
High School
If a muon is traveling at 70% the speed of light, how long will it take to decay in the observer's rest frame (i. E. , what is the observed lifetime)?.
Physics
College
A block is placed on a horizontal table. The block is then pulled to the right with a string. The block remains at rest. A spring scale, attached to the string, reads 10 N.Which force acting on the block is equal to 10 N?Force exerted by static frictionGravitational force exerted on blockForce to the left exerted by air resistanceUpward force exerted by table
Physics
High School
Which phenomenon is shown in this diagram?Earth's _________
Physics
High School
0.040-kg ice cube at 0c is placed in an insulated boc that contains 0.0075kg of steam at 100c what is the equilirbium temperature reached by this colosed
Physics
High School
with respect to saving energy, what aspect of using two-sided printing was discussed in class as providing the most signifiant benefit?
Physics
High School
find the radius of the event horizon and the density of the stellar mass black hole with mass equal to m
Physics
High School
in the 1990s, the galileo orbiter observed a phenomenon when it passed by europa, which was interpreted as evidence of an ocean beneath the ice shell. what was this phenomenon?
Physics
High School
some students were on a tour exploring the inside of a cave. while the students were in the cave, they realized they heard an echo every time that they spoke. which most likely caused the echo to occur?
Physics
College
study island genticsBelow is a Punnett square for the color of a hybrid rose. The allele y is for dark yellow and the allele Y is for pale yellow.Y yy Yy yyy Yy yyIf a rose with the genotype Yy is pale yellow in color, which alelle is dominant? A. dark yellow, y B. dark yellow, Y C. pale yellow, Y D. pale yellow, y
Physics
High School
when you look at a distant galaxy through a telescope, how is it that you're looking backward in time?
Physics
College
Two coherent sources of radio waves, A and B, are 5.00 meters apart. Each source emits waves with wavelength 6.00 meters. Consider points along the line connecting the two sources.1) At what distance from source A is there constructive interference between points A and B?2) At what distances from source A is there destructive interference between points A and B? Note that there will be two separate interference fringes between point A and point B. Enter your answers in ascending order separated by a comma.I know 1) is 2.5m but for b i need more than 1 answer
Physics
High School
a block lies on a smooth inclined plane tilted at an angle of 35e to the horizontal. (a) draw the free-body diagram for the block. (b) determine the block's acceleration as it slides down the inclined plane. (c) if the block started from rest 8.5 m up the incline from its base, determine the block's speed when it reaches the bottom of the incline. (d) how long did it take the block to reach the bottom of the inclined plane?
Physics
High School
If the mass of the crate is doubled but the initial velocity is not changed, what distance does the crate slide before stopping?.
Physics
High School
assume that the total energy e of an electron greatly exceeds its rest energy. if a photon has a wavelength equal to the de broglie wavelength of the electron, what is the photon's energy?
Physics
High School
If there are countless billions of stars and galaxies out there, then why does the night sky appear mostly black?
Physics
High School
From the point of view of conductive heat loss, which adaptations would be beneficial to animals living in extremely cold climates?Group of answer choicesThin skinLots of tissues, like muscle, with high thermal conductivFrom the point of view of conductive heat loss, which adaptations would be beneficial to animals living in extremely cold climates?Group of answer choicesThin skinLots of tissues, like muscle, with high thermal conductivityAs small a surface area as possible given the volume of the animal.Lots of tissues, like fat, with low thermal conductivityThick skinAs large a surface area as possible given the volume of the animal.
Physics
College
an electric field of 800N/C cause a charged ball of 50g mass to make an angle of 30 degree from the vertical whats the charge om fhe ball
Physics
High School
What magnetic field strength will allow the electrons to pass through without being deflected? assume that the magnetic field is confined to the region between the electrodes.
Physics
High School
a hydraulic lift is being used to elevate a car. the right side of the lift has a larger area than the left. when the two pistons are at the same vertical height, which side of the lift has higher pressure?
Physics
High School
Five grams of nitrogen gas at an initial pressure of 3.0 atm and at 20? C undergo an isobaric expansion until the volume has tripled.a.What is the gas volume after the expansion?b.What is the gas temperature after the expansion? The gas pressure is then decreased at constant volume until the original temperature is reached.c.What is the gas pressure after the decrease? Finally, the gas is isothermally compressed until it returns to its initial volume.d.What is the final gas pressure?
Physics
High School
a type of cuckoo clock keeps time by having a mass bouncing on a spring, usually something cute like a cherub in a chair. what spring constant is needed to produce a period of 0.500 s for a 0.0150-kg mass?
Physics
College
A race car makes one lap around a track of radius 50 m in 9.0 s. What was the car's centripetal acceleration?
Physics
High School
during most of its lifetime, a star maintains an equilibrium size in which the inward force of gravity on each atom is balanced by an outward pressure force due to the heat of the nuclear reactions in the core. but after all the hydrogen fuel is consumed by nuclear fusion, the pressure force drops and the star undergoes a gravitational collapse until it becomes a neutron star. in a neutron star, the electrons and protons of the atoms are squeezed together by gravity until they fuse into neutrons. neutron stars spin very rapidly and emit intense pulses of radio and light waves, one pulse per rotation. these pulsing stars were discovered in the 1960s and are called pulsars.
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