Questions and answers by

physics

Questions (197)

the maximum height a typical person can jump from a crouched start is about 60cm. By how much does the gravitational potential
1. 3 answers
2. 2,079 views
which ons is stronger 1)A solid cylinder of 2)A hollow cylinser of iron 3) A cylinder made up of slits of iron
1. 1 answer
2. 504 views
A car brakes from 60 mph to a full stop in 4 seconds. Find the accelerayion of the car during this interval
1. 0 answers
2. 445 views
what is the farmula of electric field due to postive charge
1. 1 answer
2. 376 views
A man (weighing 915 N) stands on a long railroad flatcar (weighing 2720 N) as it rolls at 18.5 m/s in the positive direction of
1. 2 answers
2. 577 views
A boxer punches a 50 Kg bag. Just as his fist hits the bag, it travels at a speed of 7 m/s. As a result of hitting the bag, his
1. 1 answer
2. 1,389 views
What is the best idea for an egg drop project. it has to survive a 5 meter drope without craking or breaking open.(grade A egg
1. 4 answers
2. 765 views
An airplane is heading due south at a speed of 590 km/h. If a wind begins blowing from the southwest at a speed of 65.0 km/h
1. 3 answers
2. 7,604 views
At t= 0, a particle starts from rest at x= 0, y= 0, and moves in the xy plane with an acceleration ->a = (4.0ihat+
1. 1 answer
2. 1,613 views
Let ->V1= -6.1 ihat + 8.0 jhat and ->V2 = -4.8 jhat + 4.2 ihat.Determine the direction of ->V1 counterclockwise from the +x
1. 2 answers
2. 560 views
pleaseh t t p : / / w w w . j i s k h a . c o m / d i s p l a y . c g i ? i d = 1 2 5 2 8 9 5 3 6 7
1. 1 answer
2. 363 views
we can say that the force of gravity is equal to mass times acceleration were the acceleration is equal to gravity sense gravity
1. 1 answer
2. 1,051 views
Calculate the acceleration due to gravity on the moon. The moon\'s radius is about 1.74 E 6 m and its mass is 7.35 E 22 kgok
1. 1 answer
2. 2,305 views
A rope of negligible mass passes over a puley of a negligible mass attached to the ceiling. One end of the rope is held by
1. 2 answers
2. 1,322 views
A coin is placced 12.0 cm from the axis of a roatating turntable of variable speed. When the speed of the turntable is slowly
1. 5 answers
2. 691 views
what is the equal and opposite force the force of frictionlike if a block is at rest on a table static friction is stil exerted
1. 3 answers
2. 532 views
take a satalite going around the earth...what allows us to say net force (radial) = Fg = Fr = ma were the Fg is the force of
1. 3 answers
2. 728 views
"The actual value of computed g, assuming no drag, also varies somewhat over the earth's surface due to the earth's spin (which
1. 1 answer
2. 1,103 views
Hi i'm doing that lab were you attach a weight to a tape which is also through a timer that puts marks on the tape at a given
1. 2 answers
2. 597 views
ok i saw the responses thanks still a little bit confusedok what variable is different or varaies in the sitations were you to
1. 1 answer
2. 339 views
ok i'm doing a labwere walking different displacements I observed that the displacements were on different grades of steepness
1. 2 answers
2. 590 views
does the slope of a distance vs. time graph showthe average velocity or the instaneous velocity I'm asked the question and don't
1. 4 answers
2. 657 views
ok a person is holding onto a piece of stringat the end of the string is a ball the person whrils it around in a circle i've
1. 2 answers
2. 649 views
i have a question in my bookcentripetal acceleration = r^-1 v^2 ok I agree but in my book acceelration is labeled as a vector
1. 2 answers
2. 1,233 views
thanks for the help earlierjust got a question I'm taking AP Physics B this year does that mean next year I would Take AP
1. 0 answers
2. 864 views
so I got a question about projectile motiontake the example of shooting of a plastic air rocket into the air and asked to
1. 3 answers
2. 611 views
ok if a car is going around a bank curve my book is telling me there is an ideal spead were no friction is required at all for
1. 5 answers
2. 512 views
I'm trying to rearange this equationfor Mu s That is the greek letter Mu subscript s... the static coeficent of friction m2 = m1
1. 1 answer
2. 468 views
a block (mass m1) on a smooth horizontal surface, connected by a thin cord that passes over a pulley to as second block (m2),
1. 3 answers
2. 1,615 views
m2a=m2g-m1am2a+m1a=m2g a= m2g/(m1+m2) I got this m2a=m2g-m1a m2a + m1 a = m2g-m1a + m1 a m2 a + m1 a = m2g (m2 a + m1 a = m2g(m2
1. 2 answers
2. 659 views
a = m2^-1 (m1 a) -gsolve for acceleartion it's the same post below they cancel out
1. 2 answers
2. 264 views
The question is: a horizontal force of magnitude 22.0 N is applied to a 2.86 kg book as the book slides a distance d = 0.73 m up
1. 1 answer
2. 570 views
1. a centripetal-acceleration addict rides in uniform circular motion with period T=2s and radius r=3m. at t1 his acceleration
1. 3 answers
2. 1,909 views
tinyurl--qwxgbv(The qwxgbv is after the slash) The proton moves through a magnetic field of magnitude 3x10^-5 T with a velocity
1. 2 answers
2. 514 views
please check my answerAn electron moves north at a velocity of 9.8 * 10^4 m/s and has a magnetic force of 5.6 * 10^-18 N west
1. 2 answers
2. 4,593 views
please tell me if this is correct,A step-down transformer has 16000 turns on the primary and 95 turns on the secondary. If the
1. 1 answer
2. 1,083 views
please tell me if thsi si correctTwo equal charges are separated by 3.7 * 10^-10 m. the force between the charges has a
1. 0 answers
2. 632 views
two point charges are 10.0 cm apart and have chargeso of 2.0 uC (micro)and -2 uC, respectively. What is the magnitude of the
1. 1 answer
2. 1,247 views
The potential differnece across a resistor is 4.4 * 10^2 V. If the resistance of the resistor is 1.8 k ohms, how much current
1. 6 answers
2. 867 views
two point charges are 10.0 cm apart and have chargeso of 2.0 uC (micro)and -2 uC, respectively. What is the magnitude of the
1. 2 answers
2. 1,548 views
pleae checkHow is current affected if the time interval over which the charge passes through a given area decreases while the
1. 1 answer
2. 561 views
What effect will be produced on a capacitor if the separation between the plates is increased?a. it will increase the charge b.
1. 1 answer
2. 1,300 views
please check:A battery converts what type of energy into electrical energy? a. mechanical b. nuclear c. solar d. chemical D When
1. 2 answers
2. 2,491 views
please checkWhich of the following is NOT a characteristic of electrical potential energy? a. it is a form of mechanical energy
1. 1 answer
2. 1,043 views
please check:Two point charges, initially 1 cm apart, are moved to a distance of 3 cm apart. By what factor do the resulting
1. 2 answers
2. 3,828 views
please check:Conductors can be charged by ___, while insulators cannot. a. grounding b. induction c. polarization d. contact D
1. 2 answers
2. 2,607 views
please check this:Which sentence best describes electrical conductors? a. electrical conductors have low mass density b.
1. 4 answers
2. 4,268 views
please check this:When a glass rod is rubbed with silk and becomes positively charged, a. electrons are removed from the rod b.
1. 1 answer
2. 706 views
A certain radio wave has a frequency of 2.0*10^6 Hz. What is its wavelength?c=3*10^8 m/s wavelength = 3*10^8 _______ 2*10^6 =
1. 2 answers
2. 3,019 views
Monochromatic light from a helium-neon laser (wavelength=632.8 nm) shines at a right angle onto the surface of a diffraction
1. 1 answer
2. 2,650 views
The critical angle of refraction for calcite is 68.4 degrees when it forms aboundary with water. Use this information to
1. 1 answer
2. 3,019 views
can you check this :a repelling force occurs between two charged objects when the charges are of a. unlike signs b. like signs
1. 5 answers
2. 7,465 views
An elevator weighing 2.00*10^5 N is supported by a steel cable. What is the tension in the cable when the elevator is
1. 1 answer
2. 4,695 views
there is a figure that looks kind of like this:E6--------------------- E= -0.378eV E5--------------------- E= -0.544eV
1. 3 answers
2. 2,274 views
please check these:Which interaction of nature binds atoms and molecules by attracting unlike charges and repulsing like
1. 3 answers
2. 808 views
is this done correctly?A step-down transformer has 16000 turns on the primary and 95 turns on the secondary. If the rms emf
1. 2 answers
2. 926 views
A concave mirror forms a real image at 17.0 cm from the mirror surface along the principal axis. If the corresponding object is
1. 1 answer
2. 2,614 views
If you stand 3.0 m in front of a flat mirror, how far away from you would yourimage be in the mirror?6.0 m If light waves are
1. 1 answer
2. 1,001 views
please check this one question:Which interaction of nature binds atoms and molecules by attracting unlike charges and repulsing
1. 2 answers
2. 464 views
please check these:A concave mirror with a focal length of 10.0 cm creates a real image 30.0 cm away on its principal axis. How
1. 1 answer
2. 1,746 views
according to Lenz's law, the magnetic field of an induced current in a conductor willa. enhance the applied field b. heat the
1. 2 answers
2. 2,797 views
checkwhich of the following modifications to a solenoid would be most likely to decrease the strength of its magnetic field? a.
1. 2 answers
2. 2,972 views
drwls said this is wrong but i don't know what's correctthe enregy gained by electrons as they are accelerated by an electric
1. 3 answers
2. 491 views
please check these 3:if the batteries in a portable CD player provide a terminal voltage of 12 V, what is the potential
1. 2 answers
2. 1,185 views
i'm still getting C as the answer to this onedrwl said its wrong When a positive charge moves in the direction of the electrical
1. 1 answer
2. 979 views
i can not find the correct answer for this onei got D but someone siad its wrogn electric field strength depends on a. charge
1. 2 answers
2. 502 views
If atmospheric refraction did not occur, how would the apparent time of sunrise and sunset be changed?a. both would be later b.
1. 0 answers
2. 1,239 views
what would be the appropriate answer choice for this question:If the batteries in a portable CD player provide a terminal
1. 1 answer
2. 518 views
please check these for me:When a positive charge moves in the direction of the electric field, what happens to the electrical
1. 1 answer
2. 781 views
please check these for me:If atmospheric refraction did not occur, how would the apparent time of sunrise and sunset be changed?
1. 1 answer
2. 2,188 views
please check these for me:What is the wavelength of microwaves of 3.0*10^9 Hz frequency? a. 0.050m b. 0.060m c. 0.10 m d. 0.20 m
1. 2 answers
2. 2,289 views
pleaase help me with this,i'm very bad in physics, and i mostly don't understand any of this stuff...can anyone explain as well
1. 1 answer
2. 1,162 views
how would i go about solving this problem?what formula shoud i use? can you please show me in steps how to do this, thanks a
1. 1 answer
2. 1,732 views
please help:A repelling force occurs between two charged objects when the charges are of a. unlike signs b. like signs c. equal
1. 2 answers
2. 1,329 views
here is my problem:a concave mirror forms a real image at 17.0 cm from the mirror surface along the principal axis. if the
1. 1 answer
2. 1,532 views
please check these:a laser can be used a. to treat glaucoma b. to measure distance c. to read bar codes d. all of the above D in
1. 3 answers
2. 1,665 views
here is my problem:a concave mirror forms a real image at 17.0 cm from the mirror surface along the principal axis. if the
1. 1 answer
2. 509 views
here is my problem:a concave mirror forms a real image at 17.0 cm from the mirror surface along the principal axis. if the
1. 1 answer
2. 546 views
find the final equilibirum temperature when 10.0 g of milk at 10.0degC is added to 1.60*10^2 g of coffee with a temperatrure of
1. 3 answers
2. 1,256 views
here is my question: A bullet with a mass of 6.00 g is fired through a 1.25 kg block of wood on a frictionless surface. The
1. 3 answers
2. 1,959 views
A certain radio wave has a frequency of 2.0 * 10^6 Hz.what is its wavelength?
1. 2 answers
2. 397 views
A 5.0 kg bucket of water is raised form a well by a rope. If the upward acceleratiopn of the bucket is 3.0 m/s^2 find the force
1. 3 answers
2. 2,094 views
A 2.0 kg mass starts from rest and slides down an inclined plane 8.0 X 10^-1 m long in .50s. what net force is acting on the
1. 3 answers
2. 13,766 views
A box slides down a 30.0 degree ramp with an acceleration of 1.20 m/s^2. Determine the coefficient of kinetic fiction between
1. 0 answers
2. 889 views
please answer my question below
1. 1 answer
2. 259 views
sigh this is killing me here...ok rockets launch at 250 m/s @ an angle of 75.0 degrees. There's a mountain 2500m away from
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2. 388 views
sigh this is killing me here...ok rockets launch at 250 m/s @ an angle of 75.0 degrees. There's a mountain 2500m away from
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2. 369 views
i have to build a catapult that will fire a projectile that will pass a 1m tall wall 1 m away from starting point and land in a
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2. 454 views
please my post from earlier
1. 2 answers
2. 400 views
What gives?projectile launched @ 10.0 m/s @ 45.0 degrees figured everyhting out go these three points I'm trying to apply my
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2. 495 views
I need help with solving these word problems.Marion rides her racing bicycle @ speed of 8 m/s. Bicycle wheels have a radius of
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2. 958 views
I need help with solving these word problems.Marion rides her racing bicycle @ speed of 8 m/s. Bicycle wheels have a radius of
1. 0 answers
2. 649 views
In a constant-volume process, 211 J of energy is transferred by heat to 1.05 mol of an ideal monatomic gas initially at 303 K.(a
1. 0 answers
2. 521 views
In a constant-volume process, 211 J of energy is transferred by heat to 1.05 mol of an ideal monatomic gas initially at 303 K.(a
1. 0 answers
2. 470 views
The sound emitted by bats has a wavelength of 3.0 mm. What is the sound's frequency in air?how do i do this??
1. 1 answer
2. 1,141 views
A hydrogen atom is in its elevnth excited state, n = 12. Using the Bohr model of hydrogen, find the linear momentum.You want to
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2. 900 views
A car tire of radius 45cm turns at a constant 14 rads/s. For a point on the edge calculatea) the tangential V b) the tangential
1. 0 answers
2. 638 views