Tuesday
May 31, 2016

Homework Help: Science: Physics

Recent Homework Questions About Physics

physics
An elevator cab is pulled upward by a cable. The cab and its single occupant have a combined mass of 1980 kg. When that occupant drops a coin, its acceleration relative to the cab is 7.30 m/s2 downward. What is the tension in the cable?
Thursday, March 17, 2016 by krals

physics
At what altitude above Earth's surface would the gravitational acceleration be 1.20 m/s2? (Take the Earth's radius as 6370 km.)
Thursday, March 17, 2016 by krals

College Physics
A student of mass M = 82 kg takes a ride in a frictionless loop-the-loop at an amusement park. The radius of the loop-the-loop is R = 15 m. The force due to the seat on the student at the top of the loop-the-loop is FN = 696 N and is vertically down. What is the apparent ...
Thursday, March 17, 2016 by Jack

math
A physics test has twenty questions worth 100 points. The test consists of true /false questions worth 3 points each and multiple choice questions worth 11 points each. How many multiple choice questions are on the test ?
Thursday, March 17, 2016 by Elizabeth

physics
(a) A concave spherical mirror forms an inverted image different in size from the object by a factor a > 1. The distance between object and image is d. Find the focal length of the mirror. (Use any variable or symbol stated above as necessary.) (b) Suppose the mirror is ...
Thursday, March 17, 2016 by Bisi urgent

physics
Question Part Points Submissions Used A flint glass plate (n = 1.66) rests on the bottom of an aquarium tank. The plate is 6.50 cm thick (vertical dimension) and is covered with a layer of water (n = 1.33) 15.0 cm deep. Calculate the apparent thickness of the plate as viewed ...
Thursday, March 17, 2016 by Anonymous urgent

physics
Two blocks are sliding along a frictionless track. Block A (mass 3.73 kg) is moving to the right at 1.50 m/s. Block B (mass 4.48 kg) is moving to the left at 1.80 m/s. Assume the system to be both Block A and Block B. a) what is the total momentum of the system before the ...
Thursday, March 17, 2016 by Anonymous

Physics
a person falls flat on their back on some slipper ice and is unconscious for a second. the horizontal position of their legs, torso and head from their feet is given by 0.48m, 1.35m and 1.7m respectively and their weights are 30kg, 50kg and 10kg. they try to sit up on the ice ...
Thursday, March 17, 2016 by Anonymous

science(physics)
A 2kg stone is droped from the top of a 20m building a)what potential energy does it posses b)At what height does its potential energy become equal to its kinetic energy? c)what is its kinetic energy just before it hits the ground? d)With what velocity does it reach the ground...
Thursday, March 17, 2016 by joe john

physics
you are trying to balance a tray of dishes to make it easy to carry. at one end of the 0.6m tray are four plates with total mass 0.5 kg with their centres of mass exactly above the left edge of the tray. how far from the left edge should you place 2.1 kg jug of milk so that ...
Thursday, March 17, 2016 by Anonymous

Physics
a 24 gramme bullet travelling at 198m/s buries itself in a 6.5kg pendulum hanging on a 2.2 m length of string, which makes the pendulum swing in an arc. determine the horizontal component of the displacement of the pendulum.
Thursday, March 17, 2016 by Anonymous

Physics
Three wires lie in a plane, placed parallel to one another and equally spaced by 0.20 m. If the wires are oriented up and down on the page, the right-hand wire carries 100 A to the top, the middle wire 300 A to the bottom, and the left-hand wire carries 200 A to the top. What ...
Thursday, March 17, 2016 by Anonymous

physics
A puck of mass m = 1.90 kg slides in a circle of radius r = 16.0 cm on a frictionless table while attached to a hanging cylinder of mass M = 3.70 kg by a cord through a hole in the table. What speed keeps the cylinder at rest?
Thursday, March 17, 2016 by krals

Physics
A very thin, infinitely long metal sheet lies in the xy-plane, between x = -w and x = w. A current of density h A/m flows in the +y-direction. What are the magnitude and direction of the magnetic field at a distance z « w above and below the sheet? Neglect end effects.
Thursday, March 17, 2016 by Anonymous

physics
When the three blocks in the figure are released from rest, they accelerate with a magnitude of 0.900 m/s2. Block 1 has mass M, block 2 has 2M, and block 3 has 2M. What is the coefficient of kinetic friction between block 2 and the table?
Thursday, March 17, 2016 by krals

physics
Suppose the coefficient of static friction between the road and the tires on a car is 0.749 and the car has no negative lift. What speed will put the car on the verge of sliding as it rounds a level curve of 31.7 m radius?
Thursday, March 17, 2016 by Anonymous

Physics help
You are standing directly under an electrical wire carrying current towards the South. If the wire is carrying 180 A and is located 12 m overhead, determine the magnitude and direction of the magnetic field where you are standing. direction of the magnetic field into the page...
Thursday, March 17, 2016 by Matt Damon

Physics
A 68.2 kg person jumps from rest off a 2.90 m-high tower straight down into the water. Neglect air resistance during the descent. She comes to rest 1.06 m under the surface of the water. Determine the magnitude of the average force that the water exerts on the diver. This ...
Wednesday, March 16, 2016 by Anonymous

Physics - Repost because of no response
In an experiment on the shuttle, an electron with a speed of 6.3 x 105 m/s [N] and a mass of 9.11 x 10-31 kg is shot through an external magnetic field. Determine the strength and orientation of the magnetic field required so that the electron's direction of travel remains...
Wednesday, March 16, 2016 by Matt Damon

physics
A basketball player makes a jump shot. The 0.593 kg ball is released at a height of 1.95 m above the floor with a speed of 7.12 m/s. The ball goes through the net 3.10 m above the floor at a speed of 4.08 m/s. What is the work done on the ball by air resistance, a ...
Wednesday, March 16, 2016 by Anonymous

Physics
Using energy considerations and assuming negligible air resistance, find the speed of a rock just before it hits the water if it is thrown from a bridge 20.2 m above water with an initial speed of 13.4 m/s? (Verify that the speed is independent of the direction the rock is ...
Wednesday, March 16, 2016 by Anonymous

science physics
A penny is dropped from a window and takes 1.82s to reach the ground. From what height was it dropped.
Wednesday, March 16, 2016 by melisa

Physics
On a frozen pond, a 11.7 kg sled is given a kick that imparts to it an initial speed of v0 = 2.01 m/s. The coefficient of kinetic friction between sled and ice is μk = 0.111. Use the work kinetic energy theorem to find the distance the sled moves before coming to rest.
Wednesday, March 16, 2016 by Anonymous

Physics
A lift of mass 200kg moves upward with a uniform velocity of 4 m/s . if efficiency of motor is 70% then input power of motor is?
Wednesday, March 16, 2016 by rpzubaern

Physics - Repost because of no response
In an experiment on the shuttle, an electron with a speed of 6.3 x 105 m/s [N] and a mass of 9.11 x 10-31 kg is shot through an external magnetic field. Determine the strength and orientation of the magnetic field required so that the electron's direction of travel remains...
Wednesday, March 16, 2016 by Matt Damon

Science
1. Which of the following best describes the movement of an object at rest if no outside forces act on it? (1 point) It will move due to inertia. Gravity will eventually cause it to move. It will stay at rest due to inertia. It will stay at rest due to gravity. Physics 2. A 2,...
Wednesday, March 16, 2016 by Tanner fox

Physics
How do you determine the work done by the frictional force?
Wednesday, March 16, 2016 by Marie

physics
two trains pass each other on parallel track. the first is 180m and travel at 60k/m. the second is 120m and travel at 46k/h. calculate the total time taken to pass each other. (a) if travelling on the same direction (b) if travelling on opposite direction. thanks....... ...
Wednesday, March 16, 2016 by mr. peee

Physics Magnetic Field
In an experiment on the shuttle, an electron with a speed of 6.3 x 105 m/s [N] and a mass of 9.11 x 10-31 kg is shot through an external magnetic field. Determine the strength and orientation of the magnetic field required so that the electron's direction of travel remains...
Wednesday, March 16, 2016 by Matt Damon

Physics current directions
I need help In studying the cross section of a straight current carrying wire, you notice that the magnetic field lines run counter-clockwise. What is the direction of the current in the wire and how do you know? 2. You are looking into a current carrying solenoid and notice ...
Wednesday, March 16, 2016 by Matt Damon

Physics
The observed frequency of a train whistle is 513Hz as it approaches a stationary observer and is 432Hz as it recedes. Find the speed of the train
Wednesday, March 16, 2016 by maryam

Physics
The 2nd harmonic of a string of length 60cm and linear mass density 1.7g/m has the same frequency as the 5th possible harmonic of a closed pipe of length 1.2m. Find the tension in the string.
Wednesday, March 16, 2016 by maryam

physics
A police car moving at 75m/s is initially behind a truck moving in the same direction at 14m/s. The natural frequency of the car's siren is 1000Hz. What is the change in frequency observed by the truck driver as the car overtakes him?
Wednesday, March 16, 2016 by maryam

Physics current directions
I need help In studying the cross section of a straight current carrying wire, you notice that the magnetic field lines run counter-clockwise. What is the direction of the current in the wire and how do you know? 2. You are looking into a current carrying solenoid and notice ...
Wednesday, March 16, 2016 by Matt Damon

Physics
The exact mass of the moon was not determined until the Apollo lunar orbiter went into orbit around the moon. They used the period and the orbital radius to find the mass. But since you already know the mass of the moon, if the spaceship was orbiting 485 km above the surface ...
Wednesday, March 16, 2016 by Ron

physics
A concave spherical mirror forms an inverted image different in size from the object by a factor a > 1. The distance between object and image is d. Find the focal length of the mirror. (Use any variable or symbol stated above as necessary.) (b) Suppose the mirror is convex...
Wednesday, March 16, 2016 by Anonymous

Physics
Calculate the force needed to bring a 1100–kg car to rest from a speed of 83.0 km/h in a distance of 118 m (a fairly typical distance for a non-panic stop). Suppose instead the car hits a concrete abutment at full speed and is brought to a stop in 1.82 m. Calculate the ...
Wednesday, March 16, 2016 by Emiliee

Physics
When an 81.6 kg adult uses a spiral staircase to climb to the second floor of his house, his gravitational potential energy increases by 2.14E+3 J. By how much does the potential energy of a 18.6 kg child increase when the child climbs a normal staircase to the second floor? I...
Wednesday, March 16, 2016 by Emiliee

Physics
How can you figure out the work done by the frictional force if the friction is 80 Newtons against a horizontal force of 290 newtons. Is it simply subtracting 290 - 80 = 210?
Wednesday, March 16, 2016 by Marie

physics
If I solved for centripetal acceleration how can you determine the magnitude of the force required to produce this centripetal acceleration? Next step please.... v=15m/s r=35m m=1300 kg 15 squared/35m=225/35= 6.43m/s squared
Wednesday, March 16, 2016 by Marie

Physics
A flywheel rotates
Wednesday, March 16, 2016 by Aditya

physics
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 together after the collision.Determine the velocity of the cars immediately after the collision.
Wednesday, March 16, 2016 by Pihu

physics
compute the mass of the following assuming if it to be a sphere of radius 6370km
Wednesday, March 16, 2016 by daniel

Physics
The force between two identical charges separated by 1 cm is equal to 90 N. What is the magnitude of the two charges?
Wednesday, March 16, 2016 by Anonymous

Physics
Ball A is attached to a string of length l=13.4 m and is released from rest. Ball B is released from rest and falls straight down. Which of the following statements for what happens at point P are correct, and which are incorrect? Explain your reasoning and state what is wrong...
Wednesday, March 16, 2016 by Supansa

Physics
A pinball machine has balls of mass 134 g. The springs have a spring constant of 93.4N/m and a relaxed length of 10 cm. To what length must the spring be compressed if it is to give a ball a speed of 2.0 m/s?
Tuesday, March 15, 2016 by Supansa

Physics
What is the potential energy of the Earth, considered as an object orbiting the Sun? Compare your result with the kinetic energy of the Earth in its orbit. Given Earth mass = 6.34×1024kg , Sun mass =1.934×1030kg, and distance from the Earth to the Sun =1.434×...
Tuesday, March 15, 2016 by Supansa

11th grade physics
Two point charges q and q' are placed respectively at two points A and B. Let O be the midpoint of [AB]. Charge q placed at A creates at O an electric field of strength E=9×10^6 V/m. Determine the resultant electric field at O when:  a) q'=q  ...
Tuesday, March 15, 2016 by vicky

Physics
someone swings a bucket of water in a vertical circle. Describe the water's motion to another person? or How would you? & also how to explain the motion of the water to them? How come the water didn't fall on the persons head?
Tuesday, March 15, 2016 by Adam

Physics
Suppose a 300–g kookaburra (a large kingfisher bird) picks up a 84.0–g snake and raises it 2.30 m from the ground to a branch. How much work did the bird do on the snake? How much work did it do to raise its own center of mass to the branch?
Tuesday, March 15, 2016 by Em

11th grade physics
Two point charges q and q' are placed respectively at two points A and B. Let O be the midpoint of [AB]. Charge q placed at A creates at O an electric field of strength E=9×10^6 V/m.  Determine the resultant electric field at O when:  a) q'=q  ...
Tuesday, March 15, 2016 by vicky

Physics
I want to know the reasoning behind each answer as well cause I have the answers, I want to know why and how to do the answers as well :) A parachutist jumps from a height of 3.1 × 10[Power 3] m and falls freely for 10 s. She then opens her parachute, and for the next ...
Tuesday, March 15, 2016 by lomonoyan

physics
Women and overweight people often experience backpain. Let us explore the reason for this. Assume the women has a weight of 60.0 daN before pregnancy. Suppose she gains 10.0 daN during pregnancy, due to weight of the fetus, placenta, amniotic fluid, etc. To make the ...
Tuesday, March 15, 2016 by jessica

11th grade physics
Two point charges q and q' are placed respectively at two points A and B. Let O be the midpoint of [AB]. Charge q placed at A creates at O an electric field of strength E=9×10^6 V/m. Determine the resultant electric field at O when: a) q'=q b) q'=-q
Tuesday, March 15, 2016 by vicky

11th grade physics
Multiple choice (show your work if any):  1) Two point charges q1=-10^-5 C and q2=-9×10^-5 C are placed respectively at two points A and B 40 cm apart.   The electric field is null at a point C outside [AB] such that :  a) AC=50cm b) AC=30cm c) AC=20cm d) ...
Tuesday, March 15, 2016 by vicky

Science: Physics
mr. slott at his fighting weight of 1000N jumps down from a platform meters above a trampoline with a spring constant (k) of 500N/M. How much does Mr.Slott strech the trampoline (x) before it brings him to a stop
Tuesday, March 15, 2016 by James

Physics
Kim(55 kg) has been wondering about the normal force. (a) How many helium balloons would it take to reduce her normal force by 50% if helium has a lifting force of 1.0 gram per liter. She estimates that a balloon contains about 5.0 liters of helium. (b) How many helium ...
Tuesday, March 15, 2016 by Next

Physics
A pinball machine has balls of mass 134 g. The springs have a spring constant of 93.4N/m and a relaxed length of 10 cm. To what length must the spring be compressed if it is to give a ball a speed of 2.0 m/s?
Tuesday, March 15, 2016 by Supansa

Physics
What is the potential energy of the Earth, considered as an object orbiting the Sun? Compare your result with the kinetic energy of the Earth in its orbit. Given Earth mass = 6.34×1024kg , Sun mass =1.934×1030kg, and distance from the Earth to the Sun =1.434×...
Tuesday, March 15, 2016 by Supansa

PHYSICS
Object A experiences a gravitational force due to object B. How would that force change if the separation distance is halved, mA triples, and mB is reduced to one quarter of its original value?
Tuesday, March 15, 2016 by Jen

Physics
A car of mass 422 kg is moving 36.0° North of East at a speed of 15.4 m/s. What is the magnitude of the momentum of the car? (magnitude - how big is it? ignore direction). What is the east-west component of the momentum of the car? I already figured out the first question ...
Tuesday, March 15, 2016 by Emily

Physics
A car of mass 422 kg is moving 36.0° North of East at a speed of 15.4 m/s. What is the magnitude of the momentum of the car? (magnitude - how big is it? ignore direction)
Tuesday, March 15, 2016 by Emily

physics 2
A 12.9 gram sample of an unknown metal at 26.5°C is placed in a Styrofoam cup containing 50.0 grams of water at 88.6°C. The water cools down and the metal warms up until thermal equilibrium is achieved at 87.1°C. A 10 percent of heat lost by water is transferred ...
Tuesday, March 15, 2016 by Ehab

physics 2
A 12.9 gram sample of an unknown metal at 26.5°C is placed in a Styrofoam cup containing 50.0 grams of water at 88.6°C. The water cools down and the metal warms up until thermal equilibrium is achieved at 87.1°C. A 10 percent of heat lost by water is transferred ...
Tuesday, March 15, 2016 by Ehab

physics
the temperature of 500g of a certain metal is raised to 100 degre celcius and it is then placed in 200g of water at 15 degre celcius.if the final steady temperature raises to 21 degre celcius,calculate the specific heat capacity of the metal
Tuesday, March 15, 2016 by Anonymous

Physics
If the air temperature is the same as the temperature of your skin (about 30.0 oC), your body cannot get rid of heat by transferring it to the air. In that case, it gets rid of the heat by evaporating water (sweat). During bicycling, a typical 70.0kg person's body produces...
Monday, March 14, 2016 by Desperate Student

Physics
A nail driven into a board increases in temperature. If we assume that 88.6 % of the kinetic energy delivered by a 2.3-kg hammer with a speed of 7.80 m/s is transformed into heat that flows into the nail and does not flow out, what is the temperature increase in K of an 272 g ...
Monday, March 14, 2016 by Desperate Student

Physics
A copper cylinder is initially at 20.0 oC. At what temperature in oC will its volume be 0.39 % larger than it is at 20.0 oC? The linear coefficient of expansion of copper is 28.6x10-6¢XC-1
Monday, March 14, 2016 by Desperate Student

Physics
A small 0.13 g bug stands at one end of a thin uniform bar that is initially at rest on a smooth horizontal table. The other end of the bar pivots about a nail driven into the table and can rotate freely, without friction. The bar has mass 0.3 g and is 2.49 cm in length. The ...
Monday, March 14, 2016 by Desperate Student

Physics
An airplane propeller is 1.1 m in length (from tip to tip) and has a mass of 2.8 kg . When the airplane's engine is first started, it applies a constant torque of 8.1 N⋅m to the propeller, which starts from rest. What is the angular acceleration of the propeller? ...
Monday, March 14, 2016 by Desperate Student

Physics
A uniform disk with mass 6 kg and radius 1.8 m is pivoted at its center about a horizontal, frictionless axle that is stationary. The disk is initially at rest, and then a constant force 31.5N is applied to the rim of the disk. The force direction makes an angle of 35 degree ...
Monday, March 14, 2016 by Desperate Student

Physics
The mass of a star is 1.89·1031 kg and it performs one rotation in 28.9 days. Find its new period (in /days) if the diameter suddenly shrinks to 0.93 times its present size. Assume a uniform mass distribution before and after.
Monday, March 14, 2016 by Bristol

AP Physics
At their closest approach, Venus and Earth are 4.2x10^10m apart. The mass of Venus is 4.87x10^24kg, the mass of Earth is 5.97x10^24kg, and G=6.67x10^-11Nm2/kg2. What is the force exerted by Venus on Earth at that point?
Monday, March 14, 2016 by Anonymous

physics
A 313 μF defibrillator capacitor is charged to 4.94×103 V. When fired through a patients chest, it loses 95 % of its charge in 40 ms. What is the resistance of the patients chest?
Monday, March 14, 2016 by shawn

Calc/Physics
Find the following questions at the depth of 25\text{m}. The gravitational acceleration is g = 9.8\text{m/s}^2 and the density of water is \rho = 1000\text{kg/m}^3. a. Find the hydrostatic force on a square steel plate with sides 2\text{m} placed horizontally. Answer (in ...
Monday, March 14, 2016 by Paul

Physics
A 313 μF defibrillator capacitor is charged to 4.94×103 V. When fired through a patients chest, it loses 95 % of its charge in 40 ms. What is the resistance of the patients chest?
Monday, March 14, 2016 by Anon

Physics HW Plz help
What is the frequency of a blue light with a wavelength of 487nm?
Monday, March 14, 2016 by Student Lexi

Physics
Women and overweight people often experience backpain. Let us explore the reason for this. Assume the women has a weight of 60.0 daN before pregnancy. Suppose she gains 10.0 daN during pregnancy, due to weight of the fetus, placenta, amniotic fluid, etc. To make the ...
Monday, March 14, 2016 by vanessa

Physics
A train moving at a constant speed of 100km/h travels east for 40min, then 30o east of north for 20 min, and finally west for 30min. What is the train's average velocity for the trip? The answer is 30 km/h (E 40 N) but I keep getting 66.6 km/h (E 30 N) help please!
Monday, March 14, 2016 by lomonoyan

11th grade physics
Multiple choice (show your work if any):  1) Two point charges q1=-10^-5 C and q2=-9×10^-5 C are placed respectively at two points A and B 40 cm apart. The electric field is null at a point C of [AB] such that :  a) AC=50cm b) AC=10cm c) AC=20cm d) point C ...
Monday, March 14, 2016 by vicky

Physics
A car starts from rest accelerate uniformly until it reaches a velocity of 30m/s after 5s.it traves with uniform velocity for 15s and is being brought to rest in 10 with a uniform retardation.dEtermine the following (a) the acceleration of the car.(b) the retardation. (c) the ...
Monday, March 14, 2016 by Omotola

About Drama
1. Which of these sentences is using appositive phrase correctly? a. The Grand Canal, which is the oldest man-made waterway in the world, is still used today in China. **?? b. The Grand Canal in China is a man-made waterway, still used, that is the oldest in the world. c. The ...
Monday, March 14, 2016 by Etta

11th Grade physics
Multiple choice (show your work if any):  1) Two point charges q1=-10^-5 C and q2=-9×10^-5 C are placed respectively at two points A and B 40 cm apart. The electric field is null at a point C of [AB] such that :  a) AC=50cm b) AC=10cm c) AC=20cm d) point C ...
Monday, March 14, 2016 by vicky

physics 11th class
Calculate the power of a crane in watts which lifts a man of 100kg to a height of 10m in 20sec
Monday, March 14, 2016 by Naman

Physics
What amount of energy is needed to change 1 kg of O degrees Celsius ice to 10 degrees Celsius water?
Monday, March 14, 2016 by Logan

physics
Women and overweight people often experience backpain. Let us explore the reason for this. Assume the women has a weight of 60.0 daN before pregnancy. Suppose she gains 10.0 daN during pregnancy, due to weight of the fetus, placenta, amniotic fluid, etc. To make the ...
Monday, March 14, 2016 by tom

physics
After placing a 0.500 m dent in the landlords van, the two management students are told they and their 200 daN beer freezer have to go. The new ramp is inclined at an angle of 32.1 o relative to the horizontal. The coefficient of static friction between the freezer and the ...
Monday, March 14, 2016 by tom

11th grade physics
Multiple choice (show your work if any): 1) Two point charges q1=-10^-5 C and q2=-9×10^-5 C are placed respectively at two points A and B 40 cm apart. The electric field is null at a point C of [AB] such that : a) AC=50cm b) AC=10cm c) AC=20cm d) point C doesn't ...
Monday, March 14, 2016 by vicky

physics
A 13 gram sample of an unknown metal at 26.5°C is placed in a Styrofoam cup containing 50.0 grams of water at 88.6°C. The water cools down and the metal warms up until thermal equilibrium is achieved at 87.1°C. A 10 percent of heat lost by water is transferred ...
Monday, March 14, 2016 by Ehab

physics
figure 3.1 shows a rectangular concrete slab of weight 18000N. It rests on a brick wall and is the roof of a bus shelter. The concrete slab is 3.0 m wide. The wall is 2.5 m from the front of the concrete slab and 0.50 m from the back. The cables behind the shelter pull ...
Monday, March 14, 2016 by Atta

Physics
A concrete slab of mass 400 kg accelerates down a concrete slop inclined at 35degree. The kenetic friction b/n the slab and slope is 0.60.Determine the acceleration of block.
Monday, March 14, 2016 by Yaekob

physics
find the angle of projection at the horizontal range is twice the maximum height of a projecyile
Monday, March 14, 2016 by junoo

physics
When the ray of light travels from air to glass slab and strikes the surface of separation at 90 degree , then it ..........
Monday, March 14, 2016 by rohit

Physics
A 5000-Hz car horn is blasted while the car is moving at 35.0 m/s toward a dazed physics student (stationary). What is the frequency of the horn heard by the student. Assume the temperature is 0°C
Sunday, March 13, 2016 by Sneha

Physics
An airplane has a velocity of v=(5m/s)i + (4m/s)j at t1= 3s. For the time interval from t1=3 seconds to t2=13s the average acceleration is a= (.5m/s^2)i + (.2m/s^2)j. At 13s find the magnitude and direction of the velocity of the airplane.
Sunday, March 13, 2016 by Bobby

Physics
A grizzly bear is running at a speed of 25m/s with respect to a man. The man is running 20m/s with respect to a rock. What is the bears speed with respect to the rock. (ALL VELOCITIES ARE IN THE SAME DIRECTION AND POSITIVE)
Sunday, March 13, 2016 by Bobby

Physics
The size of Rutherford's atom is about 0.1 nm. (a) Calculate the attractive electrostatic force between an electron and a proton at that distance. (b) Calculate the electrostatic potential energy of that atom. Express the result in unit eV. (c) The size of Rutherford's...
Sunday, March 13, 2016 by Clara

Physics
What is the wavelength of light that can cause a transition of an electron in the hydrogen atom from the orbit with n = 6 to n = 8?(answer in µm)
Sunday, March 13, 2016 by Clara

Physics
The size of Rutherford's atom is about 0.1 nm. (a) Calculate the speed of an electron that moves around a proton, based on their electrostatic attraction, if they are separated by 0.1 nm. (answer in m/s) (b) Calculate the corresponding de Broglie wavelength for Rutherford...
Sunday, March 13, 2016 by Eduardo

Physics
How much energy is required to ionize hydrogen when it is in the state with n = 6? (answer in eV)
Sunday, March 13, 2016 by Eduardo

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