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Some air at 275 kPa absolute pressure occupies 50.0m^3. Find its absolute pressure if its volume is doubled at constant
3 answers
asked by
Ricky
541 views
Your instructor asks you to compare positive and negative reinforcement and explain your conclusions in class. What will you
1 answer
asked by
danni
446 views
A constant force does 12.0 Joules of work pushing a 350 gram block a distance of 2.5 meters up a ramp. The block starts from
1 answer
asked by
ihsan
423 views
A jet has a speed of 500m/s relative to the air in which it flies and is traveling north. There is a crosswind blowing from west
1 answer
asked by
anne
424 views
force in the x-direction with magnitude Fx=18N-(0.530N/m)x is applied to a 5.50 box that is sitting on the horizontal,
5 answers
asked by
lvf
1,083 views
A stone is thrown upward from the edge of a cliff overlooking the ocean. The initial speed of the stone is 20m/s, and it's
2 answers
asked by
nicky
593 views
Three blocks are suspended at rest by the system of strings and frictionless pulleys shown in the figure below, where W = 29.0
4 answers
asked by
anthony
1,533 views
Two constant forces act on an object of mass m = 4.50 kg object moving in the xy plane as shown in the figure below. Force 1 is
1 answer
asked by
patel
859 views
Review. An object with a mass of m 5 5.10 kg is
attached to the free end of a light string wrapped around a reel of radius R 5
4 answers
asked by
Anonymous
3,994 views
An engine absorbs 2000J of heat from a hot reservoir and expels 750J to a cold reservoir during each operating cycle. What is
2 answers
asked by
christ
554 views
A string of natural length L extends to a new length L' under tensile force F. If Hooke’S law applies, the work done in
1 answer
asked by
christ
434 views
If a force of 80N extends a spring of natural length 8m by 0.4m what will be the length of the spring when the applied force is
2 answers
asked by
christ
475 views
An electric kettle contains 1.5 kg of water at
100o C and powered by a 2.0 kW electric element. If the thermostat of the kettle
4 answers
asked by
christ
2,245 views
Tinny insects such as mosquitoes can seat on the surface of water. Which physical principle makes this possible?
4 answers
asked by
christ
367 views
Calculate the change in internal energy of 2kg of water at 90 degree Celsius when it is changed to
3.30m3 of steam at 100oC . The
4 answers
asked by
christ
425 views
A 0.5kg piece of metal (c = 600/kgK) at 300 degree celcius is dumped into a large pool of water at 20 degrees celcius. Assuming
3 answers
asked by
christ
520 views
Calculate the average translational kinetic energy of a nitrogen molecule at 27 degree celcius
2 answers
asked by
christ
920 views
A piece of plastic barely floats in water. If it has a mass of 20g, what is its volume?
2 answers
asked by
christ
614 views
1 An object is thrown upward from the edge of a tall building with a velocity of 10 m/s. Where will the object be 3 s after it
7 answers
asked by
christ
2,826 views
A passenger in a moving car and a passerby standing at the road side see each other as moving in the opposite direction. Which
2 answers
asked by
christ
513 views
1 What is the gravitational field strength at a height h above the surface of the Earth? R is the radius of the earth
gR2(R+h)2
7 answers
asked by
christ
1,079 views
a watermelon seed has the following coordinates: x= -5.0, y = 8.0m, and z = 0m. find its position vector (a) in unit-vector
3 answers
asked by
stephen
1,443 views
. Show that 480 W of power is expended by a weightlifter when lifting a 60-kg barbell a vertical distance of 1.2 m in a time
1 answer
asked by
merle
452 views
A velodrome is built for use in the Olympics (see the figure below). The radius of curvature of the surface is 17.1 m. At what
1 answer
asked by
faaash
378 views
A spy satellite is in circular orbit around Earth. It makes one revolution in 6.01 hours.
how high above earth? acceleration?
3 answers
asked by
faaash
455 views
A brick of mass 0.6 kg slides down an icy roof inclined at 30.0° with respect to the horizontal.
(a) If the brick starts from
1 answer
asked by
kyoya
433 views
A bicycle and its rider together has a mass of 62 kg. What power output of the rider is required to maintain a constant speed of
2 answers
asked by
kyoya
572 views
A very thin hollow conducting sphere has a radius of R=0.12 m. The center of the sphere is at S. A charge of q=7×10−6 C is
1 answer
asked by
Evans
471 views
At a factory, a noon whistle is sounding with a frequency of 484 Hz. As a car traveling at 77 km/h approaches the factory, the
1 answer
asked by
kira
478 views
Doppler ultrasound is used to measure the speed of blood flow. If the speed of the red blood cells is v, the speed of sound in
1 answer
asked by
kira
662 views
An emphysema patient is breathing pure O2 through a face mask. The cylinder of O2 contains 0.20 ft3 of O2 gas at a pressure of
2 answers
asked by
kira
580 views
An emphysema patient is breathing pure O2 through a face mask. The cylinder of O2 contains 0.20 ft3 of O2 gas at a pressure of
1 answer
asked by
kira
433 views
How much heat is required to raise the body temperature of a 60.0-kg woman from 37.0° C to 38.2° C?
1 answer
asked by
jessica
295 views
A popular brand of pressure washer claims to deliver 330 litres per hour of water at a pressure of 80 bar, drawing 1400 W of
2 answers
asked by
Fred
521 views
In an urn, there are several colored balls, with equal numbers of each color. We add 14 balls which are all of the same new
2 answers
asked by
Anonymous
746 views
if a force of 80N extends a spring of natural length 8m by 0.4m what will be the length of the spring when the applied force
1 answer
asked by
ikye
357 views
a 0.5kg piece of metal (c=600j/kg/k) at 300c is dumped into a large pool of water at 20c. assuming the change in temperature of
4 answers
asked by
ikye
521 views
(Q1)determine the quantity of heatconducted in 30min through an iron plate2.0cm thick and 0.10m2 in area if the temperature of
3 answers
asked by
ikye
1,562 views
(Q1)calculate the electric power which must be supplied to the filament of a light bulb operating at 3000k. the total surface
2 answers
asked by
kate
789 views
(Q1)the temperature at which the tungsten filament of a 12v and 36w lamp operates is 1730c.If the temperature coefficient of
2 answers
asked by
kate
496 views
(Q1)A gas occupies a certain volume at 27c.If it is heated at constant pressure, its volume is exactly doubled at a temperature
3 answers
asked by
kate
1,162 views
An engine absorbs 2000j of heat from a hot reservoir and expels 750j to a cold reservoir during each poerating cycle, (i)what is
4 answers
asked by
kate
1,563 views
(Q1)At what altitude above the earth's surface would the acceleration due to gravity be 4.9m/s-2?Assuming the mean radius of the
4 answers
asked by
ikye
1,283 views
(Q1)What is the orbital radius and speed of a synchronous satellite which orbits the earth once every 24h? Take
1 answer
asked by
ikye
441 views
(Q1)A 40N force applied at an angle of 37c above the horizontal pulls a 5kg box on a horizontal floor. The acceleration of the
2 answers
asked by
ikye
540 views
A satellite circles a spherical planet of unknown mass in a circular orbit of radius 1.9×107m . The magnitude of the
4 answers
asked by
kerat
1,633 views
The velocity of a 2.5 kg block sliding down a frictionless inclined plane is found to be 1.25 m/s. 1.00 s later, it has a
1 answer
asked by
Anonymous
385 views
What is the distance between an object and its real image formed by a thin converging lens with focal length f = 21 cm, if the
2 answers
asked by
lin
706 views
A block of mass 2.20 kg is accelerated across a rough surface by a light cord passing over a small pulley as shown in the figure
4 answers
asked by
alix
1,707 views
A=ax+by and B=cx-dy
If a = 3 , b = 4, c = 5 and d = 2. Find the direction of -A (in degrees): relative to +x
1 answer
asked by
Dulla
287 views
Boy throws a penny into a wishing well at a velocity of 2 m/s and at an angle of 45 degrees below horizontal. If the penny takes
2 answers
asked by
Anonymous
647 views
A baseball is thrown horizontally from the top of a cliff 50 meters up. The initial velocity of the ball is 10 m/s. How far from
2 answers
asked by
Anonymous
708 views
Given three vectors
a⃗ =−i⃗ −4j⃗ +2k⃗ , b⃗ =3i⃗ +2j⃗ −2k⃗ , c⃗ =2i⃗ −3j⃗ +k⃗ , calculate a⃗
2 answers
asked by
samson
584 views
A 50kg boy suspends himself from a point on a rope tied horizontally between two vertical poles. The two segments of the rope
3 answers
asked by
samson
522 views
A rope suspended from a ceiling supports an object of weight W at its opposite end. Another rope tied to the first at the middle
2 answers
asked by
samson
520 views
A 150-kg ladder leans against a smooth wall, making an angle of 30 degrees with the floor. The centre of gravity of the ladder
1 answer
asked by
samson
479 views
A body hangs from a spring balance supported from the roof of an elevator. If the elevator has an upward acceleration of
3ms−2
1 answer
asked by
samson
667 views
A 2000 kg satellite orbits the earth at a height of 300
km. What is the speed of the satellite and its period? Take , Mass of the
2 answers
asked by
squ
504 views
An airplane has a mass of 3.41 × 104 kg and takes off under the influence of a constant net force of 3.58 × 104 N. What is the
4 answers
asked by
Anonymous
811 views
A 72.7 kg student runs up the stairs of a football stadium to a height of 11.9 m above the ground in 10.1 s.
(a) What is the
3 answers
asked by
ddreww
850 views
A 10kg mass and a 2.0kg mass are connected by a light string over a massless, frictionless pulley. if g=9.8ms^-2, what is the
1 answer
asked by
saima
1,143 views
calculate the work done on the system when 1.00mol of gas held behind a piston expands irreversibly from a volume of 1.00dm cube
1 answer
asked by
bb
451 views
Calculate the change in internal energy of 2kg of water at 90 degree celcius when it is changed to $3.30m^{3}$ of steam at $100
3 answers
asked by
Emma
634 views
Which of the following is NOT true?
evaporation occurs at any temperature of a liquid boiling takes place only at the surface of
2 answers
asked by
Emma
533 views
Tin melts at 232 under standard atmospheric pressure. Express this temperature
in kelvin
3 answers
asked by
Anonymous
379 views
when the junctions of two dissimilar metals are maintained at different temperatures an electromotive force is set up in the
2 answers
asked by
kate
520 views
A young man is throwing rocks gently up to his girlfriend's window, and he wants the rocks to hit the window moving only with a
2 answers
asked by
walter
535 views
A certain CD has a playing time of 72 minutes. When the music starts, the CD is rotating at an angular speed of 4.8 102
2 answers
asked by
nn
1,328 views
A car of mass 1400kg moving south at 11m/s collides into another car of mass 1800kg moving east at 30m/s.The cars are stock
1 answer
asked by
pawan mandal
552 views
A block of mass m = 3.45 kg slides along a horizontal table with speed v0 = 2.00 m/s. At x = 0 it hits a spring with spring
1 answer
asked by
xianhua
446 views
A block of mass m = 364 g is dragged with a string across a rough horizontal table. The string tension is T = 3.59 N, and it
1 answer
asked by
xianhua
620 views
A wind turbine is initially spinning at a constant angular speed. As the wind's strength gradually increases, the turbine
2 answers
asked by
ang
609 views
A block of mass m = 331 g is dragged with a string across a rough horizontal table. The string tension is T = 3.59 N, and it
3 answers
asked by
xianhua
1,214 views
A record player takes 4.5 sec to spin up to 45 RPM. What is the angular displacement and angular velocity when t=3 sec.
I was
1 answer
asked by
bonsnianbill
415 views
The thermal capacity of 10g of a substance is 8 calories. the specific heat is in J/kg-K
1 answer
asked by
yogeg
461 views
two sinusoidal waves traveling in the same direction having same frequency but different amplitudes and maintaining a phase
2 answers
asked by
mayuri
638 views
A 221-kg log is pulled up a ramp by means of a rope that is parallel to the surface of the ramp. The ramp is inclined at 27.7°
2 answers
asked by
BrookeNeed
478 views
A 1200 kg car traveling north at 10 m/s is rear-ended by a 2000 kg truck traveling at 27 m/s. What is the total momentum before
3 answers
asked by
ME
1,009 views
a rubber ball is thrown against a horizontal wall and bounces back with the same speed it came in at. The change in momentum
3 answers
asked by
carol
1,413 views
1. A small fly wheel fitted to a motor with a moment of inertia of 80 kg m² slows down from 9000 rpm to 5500 rpm in 7.5
1 answer
asked by
mike
429 views
a landscape architect is planning an artificial waterfall in a city park. water flowing at 1.70 m/s will leave the end of a
4 answers
asked by
ali
3,120 views
A football kicker can give the ball an initial speed of 25 m/s. What are the (a) least and (b) greatest elevation
angles at which
1 answer
asked by
peachy
370 views
A toy rocket has a mass 0f 350g at launch.
The force it produces is 15N and it is fired at an angle of 65° to the horizontal.
1 answer
asked by
abdela
224 views
A steering wheel is rotated through 128°, Its radius is 22 cm. How far would a point on the steering wheel’s edge move? *
2 answers
asked by
hussein
736 views
what is the formula of effort
1 answer
asked by
Zekarias Zeleke
95 views
Two particles (m1 = 0.20 kg, m2 = 0.30 kg) are positioned at the ends of a 2.0-m long rod of negligible mass. What is the moment
4 answers
asked by
hh
670 views
A helicopter 8.40 m above the ground and descending at 4.50 m/s drops a package from rest (relative to the helicopter). We have
1 answer
asked by
kyle
84 views
Heat transfer in fluids occur basically through the process of ___________
conduction reflection convection radiation
1 answer
asked by
alamin
60 views
A 2 kg block is at rest on a rough surface. A horizontally applied force of 10 N is applied and after it has moved 6 m it has
1 answer
asked anonymously
78 views
what is a negatively charged particle in the outermost energy level called? All I know about it is that the 4th letter of the
1 answer
asked anonymously
43 views
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