Questions LLC
Login
or
Sign Up
Ask a New Question
Categories
phys
Questions
The coefficient of expansion of a certain steel is 0.000012 per C^(degree) . The coefficient of volume expansion, in
6 answers
asked by
jay
6,064 views
A short 10-g string is used to pull a 50-g toy across a frictionless horizontal surface. If a
3.0 x 10^(–2)-N force is applied
5 answers
asked by
tony
6,898 views
A car comes to a bridge during a storm and finds the bridge washed out. The driver must get to the other side, so he decides to
5 answers
asked by
aybuke
12,725 views
A cylinder in a car engine takes Vi = 4.50 10-2 m3 of air into the chamber at 30° C and at atmospheric pressure. The piston
4 answers
asked by
opp
1,764 views
n object is placed 40 cm from a lens of focal length -10 cm. The image is virtual or real? inverted or upright? diminshed or
4 answers
asked by
rebecca
1,217 views
A circular test track for cars has a circumference of 2.1 km . A car travels around the track from the southernmost point to the
4 answers
asked by
Jessica
2,820 views
A 12-kg crate rests on a horizontal surface and a boy pulls on it with a force that is 30 degree below the horizontal. If the
5 answers
asked by
tony
7,914 views
a 5 kg concrete block accelerates down a 34 degree slope at 4.2m/s^2. Find the coefficient of friction between the block and the
4 answers
asked by
slien
2,282 views
A wheel starts from rest and has an angular acceleration of 4.0 rad/s^(2). When it has made 10 rev its angular velocity is:
5 answers
asked by
jay
5,555 views
The heat capacity of object B is twice that of object A. Initially A is at 300 K and B is at 450 K. They are placed in thermal
4 answers
asked by
jay
1,449 views
the 300-series shinkansen train of japan has aluminum cars, so that it can reach high speeds more easily. ten of the sixteen
4 answers
asked by
arriell
1,939 views
A boat is traveling upstream at 14 mph with respect to a river that is flowing at 6 mph (with respect to the ground). A man runs
5 answers
asked by
jai
3,544 views
A point charge of -4 mu or micro CC is located at x = 4 m, y = -2 m. A second point charge of 12 mu or micro CC is located at x
3 answers
asked by
kenzie
1,747 views
Given Vector A with magintude 9.17 feet and Vector B with magnitude of 10.58 feet, what is the resultant of the two vectors
1 answer
asked by
Jawad
505 views
The speed of ocean waves depends on their wavelength λ (in meters) and the gravitational field strength g (in m/sˆ2) in
1 answer
asked by
Cheyenne
609 views
1. A vector has (at minimum) how many parts associated with it?
2. When adding three vectors graphically one needs to: a. Spin
1 answer
asked by
Jawad
1,105 views
a projectile is launched at 35 degrees above the horizontal with an initial velocity of 120m/s. What is the projectile's speed 3
1 answer
asked by
slien
774 views
The proper length of one spaceship is 5 times that of another. The two spaceships are travelling in the same direction and,
1 answer
asked by
slien
558 views
a spaceship travels with a speed of 0.7c as it passes by the Earth on its way to a distant star. The pilot of the spaceship
1 answer
asked by
slien
534 views
a spaceship travels with a speed of 0.7c as it passes by the Earth on its way to a distant star. The pilot of the spaceship
1 answer
asked by
slien
438 views
Imagine a motorcycle rider moving with a speed 0.7c past a stationary observer. If the rider tosses a ball in the forward
1 answer
asked by
slien
1,055 views
Find the kinetic energy of a particle with a mass of one gram moving with half the speed of light. Compare the answer with the
1 answer
asked by
slien
423 views
Suppose a newly found elementary particle has an average lifetime, T=30 ns, when at rest. In order for this new elementary
1 answer
asked by
slien
511 views
When a car is weighed, it is allowed to move over a scale which records a reading as the front wheels go over the scale, and a
1 answer
asked by
tyler
654 views
or..can someone tell me what will happen when a bar magnet is placed in a current carrying coil?
1 answer
asked by
AllyKat
306 views
A long distance swimmer is able to swim through still water at 4km/hr. She wishes to swim from Port Angeles, WA due north to
2 answers
asked by
Christine
1,045 views
A plane takes off at St. Louis, flies straight to Denver, and then returns the same way. The plan flies at the same speed with
4 answers
asked by
Gina
1,538 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+
3 answers
asked by
physics
1,506 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
5 answers
asked by
physics
7,489 views
A small metal cylinder rests on a circular turntable that is rotating at a constant speed.
The small metal cylinder has a mass of
3 answers
asked by
Chelsea
644 views
a plane travels at 400 mi/r to a city away. Determine the time it takes for the round trip
1 answer
asked by
roek
414 views
A 0.190 kg piece of copper is heated and fashioned into a bracelet. The amount of energy transferred as heat to the copper is
3 answers
asked by
abbigail
1,377 views
Sam is taking his girlfriend Sally out for a ride in his boat. He starts out at rest. He accelerates with an acceleration of
3 answers
asked by
ami
525 views
Consider an antelope being chased by a tiger. The antelope is running at a velocity of 5.21 m/s at an angle 14.3 degree E of S.
4 answers
asked by
ami
1,121 views
A toy airplane of mass 0.159 kg is tied to the ceiling with a string. The airplane moves in a horizontal circle of radius 2.97
2 answers
asked by
stacy
1,013 views
A disk rolls down a slope. It rotational axis is its center of mass. It is rotation at a constant angular speed making 34.0 full
1 answer
asked by
ami
695 views
Water flows steadily from an open tank into a pipe as shown in the figure. The elevation of the top of the tank is 12.3 m, and
4 answers
asked by
ami
1,714 views
It is not a homework,but this is my question and I hope sb to explain it for me:
There is not snow is the area I am living, but
3 answers
asked by
Bun
446 views
What is the minimum lens size (in meters) that will permit just resolving 2 stars 1.1 second apart using light of 510nm?
4 answers
asked by
bun
337 views
1) Pf(x)= f(-x), p operator
Find the eigenvalues and eigenfunction of p 2)Show [f(xop), d/dx] = - df/dx
1 answer
asked by
Bun
432 views
show [f(xop), d/dx] = -df/dx
please help, can sb gives a hint? I really appreciate.
1 answer
asked by
Bun
413 views
“There are many social and cultural contexts you interact with that strongly influence development. These contexts include
2 answers
asked by
Joseph
509 views
A 5g bullet is fired from a 5000g gun. If the bullet leaves the gun going +800m/s, with what speed does the gun recoil?
3 answers
asked by
gg
531 views
A mechanic pushes a 2.0 103 kg car from rest to a speed of v, doing 5350 J of work in the process. During this time, the car
2 answers
asked by
hpj
1,099 views
The space shuttle, with an initial mass M = 2.41E+6 kg, is launched from the surface of the earth with an initial net
2 answers
asked by
leon
853 views
An observer detects an apparent frequency of 505 hz coming from a 500 hz source. Which is true?
a. the observer is moving due
3 answers
asked by
Jarod
518 views
A 1155-N uniform beam is attached to a vertical wall at one end and is supported by a cable at the other end. A W = 1915-N crate
2 answers
asked by
michelle
616 views
An airplane must reach a speed of 185 mi/h to take off. If the runway is 500 m long, what is the minimum value of the
2 answers
asked by
Lisa
1,168 views
To totally convert a given amount of mechanical energy into heat is
Choose one answer. a. impossible. b. possible. c. impossible
2 answers
asked by
Anonymous
779 views
Find the acceleration due to gravity on a planet whose mass is four times the mass of Earth and whose radius is half the radius
1 answer
asked by
ayyashi
454 views
An astronaut drops an object from rest (relative to the planet) on a planet alpha (having the same radius as of earth) from an
2 answers
asked by
ayyashi
536 views
Four point masses are at the corners of a
square whose side is 20 cm long (see Fig 3). What is the magnitude of the net
3 answers
asked by
ayyashi
529 views
Doug pushes a 4.65 kg crate up a 2.00 m high 13.0° frictionless slope by pushing it with a constant horizontal force of 35.8 N.
1 answer
asked by
tc
375 views
How many kcal of heat are required to vaporize 25.0 kg of water at 100C?
1 answer
asked by
Dennis
1,167 views
What is the total translational kinetic energy of the gas molecules of 0.470 mol of air at atmospheric pressure that occupies a
1 answer
asked by
opp
457 views
A 0.600-kg aluminum teakettle contains 4.00 kg of water at 26.0° C. How much heat is required to raise the temperature of the
2 answers
asked by
opp
527 views
A 30.0-g lead bullet leaves a rifle at a temperature of 89.0° C and hits a steel plate. If the bullet melts, what is the
3 answers
asked by
opp
658 views
A 10.9-g iron bullet with a speed of 4.00 102 m/s and a temperature of 20.0° C is stopped in a 0.400-kg block of wood, also at
4 answers
asked by
opp
1,367 views
A reversible engine with an efficiency of 32.0% has TC = 304.0 K.
(a) What is TH? (b) How much heat is exhausted for every 0.138
1 answer
asked by
opp
373 views
A town is planning on using the water flowing through a river at a rate of 4.9 106 kg/s to carry away the heat from a new power
3 answers
asked by
opp
914 views
A rock stuck in the tread of a 56.0--diameter bicycle wheel has a tangential speed of 3.10 . When the brakes are applied, the
1 answer
asked by
keren
350 views
Mike throws a ball upward & toward the east at a 20.0 angle with a speed of 51.0 . Nancy drives east past Mike at 15.0 at the
3 answers
asked by
keren
732 views
If your metabolic consumption of oxygen is 1500ml/min, what is the P02 of venous blood?
1 answer
asked by
lynn
372 views
A woman on a bridge 84.7 m high sees a raft floating at a constant speed on the river below. She drops a stone from rest in an
1 answer
asked by
Emily
657 views
A pellet gun is fired straight downward from the edge of a cliff that is 28.5 m above the ground. The pellet strikes the ground
1 answer
asked by
Emily
437 views
A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 3.30 m/s. The car is a
1 answer
asked by
Emily
365 views
Find every angle θ between 0 and 360° for which the ratio of sin θ to cos θ is -3.00. (Round your answer to the nearest
4 answers
asked by
sedef
2,902 views
A rectangular plate has a length of (20.0 ± 0.2) cm and a width of (8.3 ± 0.1) cm. Calculate the area of the plate, including
1 answer
asked by
sedef
449 views
An automobile tire is rated to last for 35,000 miles. To an order of magnitude, through how many revolutions will it turn?
1 answer
asked by
sedef
657 views
Two concentric circular wire loops in the same plane each carry a current. The larger loop has a current of 8.62 A circulating
2 answers
asked by
opp
826 views
Heat Q flows spontaneously from a reservoir at 481 K into a reservoir at 298 K. Because of the spontaneous flow, 2760 J of
1 answer
asked by
Redgy22
617 views
The ammonia molecule has a dipole moment of . Ammonia molecules in the gas phase are placed in a uniform electric field with
1 answer
asked by
Anonymous
474 views
Although most natural potassium nuclei are stable 39K (93.3%) or 41K (6.7%) nuclei, about 0.0117% are radioactive 40K nuclei,
2 answers
asked by
Anonymous
835 views
male erection is an example of __________. no thought or emotion is required for it to occur, but conscious control can
1 answer
asked by
mike/meka
427 views
An object with an initial velocity of 12 m/s west experiences a constant acceleration of 4 m/s^2 west for 3 seconds. During this
4 answers
asked by
jay
4,441 views
A 1000-kg airplane moves in straight flight at constant speed. The force of air friction is 1800 N. The net force on the plane
3 answers
asked by
tony
648 views
A 1000-kg airplane moves in straight flight at constant speed. The force of air friction is 1800 N. The net force on the plane
6 answers
asked by
q.
1,194 views
A disk with a rotational inertia of 2.0 kg.m^2 and a radius of 0.40 m rotates on a frictionless fixed axis perpendicular to the
4 answers
asked by
jay
2,311 views
Calculate the total force of the atmosphere acting on the top of a table that measures 1.9m×2.1m really have a clue how to
3 answers
asked by
john david
1,111 views
A motorist is driving at 20m/s{\rm m/s} when she sees that a traffic light 200m{\rm m} ahead has just turned red. She knows that
3 answers
asked by
Av
1,140 views
A rocket is launched straight up with constant acceleration. Four seconds after liftoff, a bolt falls off the side of the
2 answers
asked by
Av
552 views
An electron of kinetic energy 50 keV moves in a circular orbit perpendicular to a magnetic field of 0.405 T.
Find the radius of
1 answer
asked by
sara
614 views
While spinning in a centrifuge, a 70.0 kg astronaut experiences an acceleration of 5.00 g, or five times the acceleration due to
4 answers
asked by
Ashley
1,327 views
If you drop a cricket ball from a very high tower, what is the final velocity after 3.5 seconds? The answer will be in m s-1
1 answer
asked by
Anonymous
311 views
Two blocks of mass
m1 = 1.70 kg and m2 = 5.20 kg are connected by a massless cord passing over a frictionless pulley as shown in
1 answer
asked by
victpr
801 views
10. A rock is thrown upwards from the top of a 45 m tall cliff with an initial speed of 15 m/s. (a) What is the maximum height
1 answer
asked by
whit tone
331 views
A ball of mass m makes a head-on elastic collision with a second ball (at rest) and rebounds with a speed equal to 0.300 its
3 answers
asked by
axel
555 views
The flywheel of a steam engine begins to rotate from rest with a constant angular acceleration of 1.25 rad/s2. It accelerates
1 answer
asked by
araya
260 views