Thursday

September 18, 2014

September 18, 2014

**Recent Homework Questions About Physics**

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**Physics**

A student throws a set of keys vertically upward to her sorority sister, who is in a window 3.80 m above. The keys are caught 1.80 s later by the sister's outstretched hand. (b) What was the velocity of the keys just before they were caught?
*Wednesday, September 11, 2013 at 2:49pm*

**Physics**

A hockey player is standing on his skates on a frozen pond when an opposing player, moving with a uniform speed of 2.0 m/s, skates by with the puck. After 2.00 s, the first player makes up his mind to chase his opponent. If he accelerates uniformly at 0.10 m/s2, determine each...
*Wednesday, September 11, 2013 at 2:44pm*

**Physics**

A train is traveling down a straight track at 25 m/s when the engineer applies the brakes, resulting in an acceleration of −1.0 m/s2 as long as the train is in motion. How far does the train move during a 50 s time interval starting at the instant the brakes are applied?
*Wednesday, September 11, 2013 at 2:42pm*

**physics**

find the acceleration produced by a net force of 300.0 N on a mass of 0.75 kg.
*Wednesday, September 11, 2013 at 2:08pm*

**physics**

City B is northwest of City A, and the 400 mile trip by car takes 8 hours. The cities are 320 miles apart if able to travel in a straight line. What is the speed of a trip from City A to City B?
*Wednesday, September 11, 2013 at 12:15pm*

**physics**

During a track event two runners, Mary, and Alice, round the last turn and head into the final stretch with Mary a distance d = 4.0 m in front of Alice. They are both running with the same speed of v0= 7.0 m/s. When the finish line is a distance L= 45.0 m away from Alice, ...
*Wednesday, September 11, 2013 at 11:23am*

**Physics**

An alpha particle has a mass of 6.64x10^-27
*Wednesday, September 11, 2013 at 10:38am*

**Physics I**

Suppose a rocket launches with an acceleration of 32.0m/s^2. What is the apparent weight of an 95-kg astronaut aboard this rocket?
*Wednesday, September 11, 2013 at 12:20am*

**Physics I**

Suppose a rocket launches with an acceleration of 32.0m/s^2. What is the apparent weight of an 95-kg astronaut aboard this rocket?
*Tuesday, September 10, 2013 at 11:51pm*

**physics **

a baseball was launched from 1.5 m above the ground. the ball was caught at a position 4.5m above the ground with a speed of 28m/s moving at a angle of 30 degrees below horizontal: find initial velocity - time of flight - range
*Tuesday, September 10, 2013 at 11:43pm*

**physics **

a baseball was launched from 1.5 m above the ground. the ball was caught at a position 4.5m above the ground with a speed of 28m/s moving at a angle of 30 degrees below horizontal: find initial velocity - time of flight - range
*Tuesday, September 10, 2013 at 11:41pm*

**physics **

a baseball was launched from 1.5 m above the ground. the ball was caught at a position 4.5m above the ground with a speed of 28m/s moving at a angle of 30 degrees below horizontal: find initial velocity - time of flight - range
*Tuesday, September 10, 2013 at 11:40pm*

**physics**

To take off from the ground, an airplane must reach a sufficiently high speed. The velocity required for the takeoff, the takeoff velocity, depends on several factors, including the weight of the aircraft and the wind velocity. Part A: A plane accelerates from rest at a ...
*Tuesday, September 10, 2013 at 11:38pm*

**physics**

A pellet gun is fired straight downward from the edge of a cliff that is 23.1 m above the ground. The pellet strikes the ground with a speed of 38.6 m/s. How far above the cliff edge would the pellet have gone had the gun been fired straight upward? I get 99.118 but the answer...
*Tuesday, September 10, 2013 at 11:20pm*

**physics**

A pellet gun is fired straight downward from the edge of a cliff that is 23.1 m above the ground. The pellet strikes the ground with a speed of 38.6 m/s. How far above the cliff edge would the pellet have gone had the gun been fired straight upward? I get 99.118 but the answer...
*Tuesday, September 10, 2013 at 11:18pm*

**Physics**

A hot-air balloon is rising upward with a constant speed of 2.27 m/s. When the balloon is 9.14 m above the ground, the balloonist accidentally drops a compass over the side of the balloon. How much time elapses before the compass hits the ground? I solve for the quadratic and ...
*Tuesday, September 10, 2013 at 10:43pm*

**physics**

A hot air balloon is ascending straight up at a constant speed of 6.50 m/s. When the balloon is 13.0 m above the ground, a gun fires a pellet straight up from ground level with an initial speed of 34.0 m/s. Along the paths of the balloon and the pellet, there are two places ...
*Tuesday, September 10, 2013 at 10:21pm*

**physics**

A car travels in a straight line for 4h at a constant spped 73km/h. What is its acceleration? Answer in units m/s^2
*Tuesday, September 10, 2013 at 9:08pm*

**physics**

A fire hose ejects a stream of water at an angle of 36.4 ° above the horizontal. The water leaves the nozzle with a speed of 20.1 m/s. Assuming that the water behaves like a projectile, how far from a building should the fire hose be located to hit the highest possible fire?
*Tuesday, September 10, 2013 at 9:00pm*

**Physics**

A car travels due east with a speed of 50.0 km/h. Raindrops are falling at a constant speed vertically with respect to the Earth.The traces of the rain on the windows of the car make an angle of 60 degrees with the vertical. Find the velocity of the rain with respect to (a) ...
*Tuesday, September 10, 2013 at 8:53pm*

**physics**

these values were obtained as the mass of a bar of metal: 8.83g 8.84g 8.82g the known mass is 8.83g the values are both accurate and precise- true or false
*Tuesday, September 10, 2013 at 7:59pm*

**Physics II**

Two charges attract each other with a force of 3.0 N. What will be the force if the distance between them is reduced to one-ninth of its original value?
*Tuesday, September 10, 2013 at 6:44pm*

**Physics**

The Space Shuttle travels at a speed of about 9.11 x 103 m/s. The blink of an astronaut's eye lasts about 93.4 ms. How many football fields (length = 91.4 m) does the Space Shuttle cover in the blink of an eye?
*Tuesday, September 10, 2013 at 4:28pm*

**Physics**

A police car is traveling at a velocity of 15.0 m/s due north, when a car zooms by at a constant velocity of 40.0 m/s due north. After a reaction time 0.500 s the policeman begins to pursue the speeder with an acceleration of 6.00 m/s^2. Including the reaction time, how long ...
*Tuesday, September 10, 2013 at 4:22pm*

**physics**

The 20-g centrifuge at NASA's Ames Research Center in Mountain View, California, is a horizontal, cylindrical tube 58.0 ft long and is represented in the figure below. Assume an astronaut in training sits in a seat at one end, facing the axis of rotation 29.0 ft away. ...
*Tuesday, September 10, 2013 at 4:19pm*

**physics**

Two geological field teams are working in a remote area. A global positioning system (GPS) tracker at their base camp shows the location of the first team as 42 km away, 21° north of west, and the second team as 29 km away, 37° east of north. When the first team uses ...
*Tuesday, September 10, 2013 at 1:08pm*

**physics**

Two stones are thrown vertically up at the same time. The first stone is thrown with an initial velocity of 11.5 m/s from a 12th floor balcony of a building and hits hits the ground after 4.6 seconds. With what initial velocity should the second stone be thrown from a 4th ...
*Tuesday, September 10, 2013 at 12:26pm*

**Physics**

A truck on a straight road starts from rest and accelerates at 3.0 m/s2 until it reaches a speed of 18.1 m/s. Then the truck travels for 24.5 s at constant speed until the brakes are applied, stopping the truck in a uniform manner in an additional 5.7 s. (a) How long is the ...
*Tuesday, September 10, 2013 at 10:30am*

**Physics 210**

A football kicker is trying to make a field goal from 42.0m. If he kicks at 35∘ above the horizontal, what minimum speed is needed to clear the 3.10m high crossbar?
*Tuesday, September 10, 2013 at 1:22am*

**physics**

i need help....please If you Fourier sample the state 1/√22(|000>−|001>+|010>−|011>+|100>−|101>+|110>−|111>), which of the following states can be the outcome of your measurement? Select all that apply. 1. |...
*Monday, September 9, 2013 at 11:58pm*

**physics**

A volleyball is spiked so that it has an initial velocity of 18 m/s directed downward at an angle of 53° below the horizontal. What is the horizontal component of the ball's velocity when the opposing player fields the ball?
*Monday, September 9, 2013 at 11:47pm*

**Physics 2 **

An unknown substance has a mass of 0.125 kg and an initial temperature of 98.0°C. The substance is then dropped into a calorimeter made of aluminum containing 0.285 kg of water initially at 30.0°C. The mass of the aluminum container is 0.150 kg, and the temperature of ...
*Monday, September 9, 2013 at 11:40pm*

**Physics**

Suppose we have a quantum circuit that takes the input |0> and outputs |+>, and also takes the input |1> and outputs −|−>. If we input √2*i/√3|+> + 1√3|−>, what does the circuit output? In the form a│0> + b│1...
*Monday, September 9, 2013 at 8:30pm*

**Quantum physics**

Suppose we have a quantum circuit that takes the input |0> and outputs |+>, and also takes the input |1> and outputs −|−>. If we input √2*i/√3|+> + 1√3|−>, what does the circuit output? In the form a│0> + b│1...
*Monday, September 9, 2013 at 8:30pm*

**physics **

While following the directions on a treasure map, a pirate walks 38.8 m north, then turns and walks 5.8 m east. What is the magnitude of the single straight-line displacement that the pirate could have taken to reach the treasure? Answer in units of m At what angle with the ...
*Monday, September 9, 2013 at 7:50pm*

**physics**

Henrietta is going off to her physics class, jogging down the sidewalk at a speed of 2.65m/s . Her husband Bruce suddenly realizes that she left in such a hurry that she forgot her lunch of bagels, so he runs to the window of their apartment, which is a height 54.8m above the ...
*Monday, September 9, 2013 at 7:18pm*

**Physics**

Automobile Airbags. The human body can survive an acceleration trauma incident (sudden stop) if the magnitude of the acceleration is less than 250 m/s2. If you are in an automobile accident with an initial speed of 60 km/h (37 mi/h) and you are stopped by an airbag that ...
*Monday, September 9, 2013 at 6:37pm*

**Physics**

Two cars travel in the same direction along a straight highway, on at a constant speed of 38.0 mi/h and the other at 89.0 mi/h. (a) Assuming they start at the same point, how much sooner does the faster car arrive at a destination 44.0 mi away? (b) How far must the faster car ...
*Monday, September 9, 2013 at 6:33pm*

**physics**

1. When material decays, it emits a particle. An experiment similar to the J.J. Thomson experiment is performed to determine the charge-to-mass ratio of this particle. It is found that the particle moves undeflected through mutually perpendicular magnetic and electric fields ...
*Monday, September 9, 2013 at 3:49pm*

**physics**

A certain centrifuge produces a centripetal acceleration of magnitude exactly 1090g at a point 12.3 cm from the axis of rotation. Find the number of revolutions per second.
*Monday, September 9, 2013 at 3:48pm*

**physics**

f a police car is traveling along at 40 mi/hr and speeds up to 90 mi/hr to catch a speeder and it takes a total time of 1hr to finally catch the speeder. what was the police car's acceleration?
*Monday, September 9, 2013 at 3:18pm*

**physics**

A long, straight metal rod has a radius of 6.00 cm and a charge per unit length of 36.0 nC/m. Find the electric field at the following distances from the axis of the rod, where distances are measured perpendicular to the rod. (a) 1.50 cm N/C (direction) (b) 13.5 cm N/C (...
*Monday, September 9, 2013 at 2:02pm*

**physics**

A rocket blasts off. In 10.0 seconds it is at 10,000 ft, traveling at 3600 mph. Assuming the direction is up, calculate the acceleration. (Hint: the rocket is not under constant acceleration).
*Monday, September 9, 2013 at 11:51am*

**Physics**

Could someone explain to me about how live, earth and neutral wires work?
*Monday, September 9, 2013 at 9:18am*

**physics**

A jogger follows this route every morning. Assume each segment is a straight line. A= 1000m due south B= 500m at 53 degrees east of south C= 400m due east What is the jogger's displacement from start to end including magnitude and direction?
*Monday, September 9, 2013 at 8:18am*

**Physics**

A motorcycle starts from rest witha constant acceleration of 0.10m/s^2. After 30 s, the bike has its acceleration doubled( assume instantaneously ). How fast is it moving after a total distance of 200 m
*Monday, September 9, 2013 at 2:31am*

**physics**

Suppose that it takes exactly 17.0 hr to drain a container of 6.20 liters of water. What is the average mass flow rate (in kilograms/second) of water from the container? Assume that the density (mass/volume) of water is exactly 1 g/cm^3.
*Monday, September 9, 2013 at 1:22am*

**physics**

if a swimmer swims 85.4 yards in five minutes, how many meters will he swim in 70.0 seconds?
*Sunday, September 8, 2013 at 10:34pm*

**physics**

A staging that weighs W staging supports a painter weighing 770 N. The reading on the left scale is 660 N and the reading on the right scale is 410 N. What is the weight of the staging? Answer in units of N
*Sunday, September 8, 2013 at 10:29pm*

**physics - electric fields**

A 2.00 square meter flat surface is placed in a uniform electric field of magnitude 6.00 N/C. If the surface is oriented so that the field lines are all parallel to the surface, find the magnitude of the electric flux through this area
*Sunday, September 8, 2013 at 8:23pm*

**Physics**

Both car A and car B leave school at the same time, traveling in the same direction. Car A travels at a constant speed of 77 km/h, while car B travels at a constant speed of 89 km/h. 1. How long does it take car A to reach a gas station a distance 247 km from the school? ...
*Sunday, September 8, 2013 at 6:45pm*

**Physics**

A firefighter 41.8m away from a burning building, directs Zach stream of water from a ground level fire hose at an angle of 33.0 degrees above the horizontal . If the speed of the streams it leaves the hose is 42.7m/s, at what height will the stream of water hit the building
*Sunday, September 8, 2013 at 6:14pm*

**Calculus/Physics?**

Define a function f(v)={c:v€[0,v(subscript)0) 0 : v€ [v(subscript)0,+∞} On v €[0,+∞). Here and v(subscript)0 are positive constants. A) Compute ∫v=0,+∞; f(v)dv B) Suppose c=1/v(subscript)0, find ∫v=0,+∞;v f (v)dv
*Sunday, September 8, 2013 at 6:10pm*

**Physics**

Suppose a single electron orbits about a nucleus containing two protons (+2e), as would be the case for a helium atom from which one of the two naturally occurring electrons is removed. The radius of the orbit is 2.65 10-11 m. Determine the magnitude of the electron's ...
*Sunday, September 8, 2013 at 5:18pm*

**Physics**

A circular surface with a radius of 0.058 m is exposed to a uniform external electric field of magnitude 1.49 104 N/C. The electric flux through the surface is 74 N · m2/C. What is the angle between the direction of the electric field and the normal to the surface?
*Sunday, September 8, 2013 at 5:18pm*

**Physics**

In the rectangle in the drawing, a charge is to be placed at the empty corner to make the net force on the charge at corner A point along the vertical direction. What charge (magnitude and algebraic sign) must be placed at the empty corner? (the rectangle has +3 uC charges in ...
*Sunday, September 8, 2013 at 5:17pm*

**Physics**

Suppose a single electron orbits about a nucleus containing two protons (+2e), as would be the case for a helium atom from which one of the two naturally occurring electrons is removed. The radius of the orbit is 2.65 10-11 m. Determine the magnitude of the electron's ...
*Sunday, September 8, 2013 at 5:16pm*

**physics**

You throw a baseball directly upward at time t = 0 at an initial speed of 12.5 m/s. What is the maximum height the ball reaches above where it leaves your hand? At what times does the ball pass through half the maximum height? Ignore air resistance and take g = 9.80 m/s2.
*Sunday, September 8, 2013 at 5:11pm*

**PHYSICS**

express dissipated power in terms of voltage and resistance. express dissipated power in terms of current and resistance
*Sunday, September 8, 2013 at 5:01pm*

**physics**

A Boeing 787 is initially moving down the runway at 3.0 m/s preparing for takeoff. The pilot pulls on the throttle so that the engines give the plane a constant acceleration of 1.7 m/s2. The plane then travels a distance of 1900 m down the runway before lifting off. How long ...
*Sunday, September 8, 2013 at 4:23pm*

**physics**

The Graph above shows the speed of a car traveling in a straight line as a function of time. The car accelerates uniformly and reaches a speed Vb of 4.00 m/s in 8.00 seconds. Calculate the distance traveled by the car from a time of 1.20 to 4.40 seconds.
*Sunday, September 8, 2013 at 4:22pm*

**physics**

A commuting student leaves home and drives to school at an average speed of 42.0 km/h. After 20.0 min he realizes that he has forgotten his homework and returns home to get it at the same average speed. It takes 7.0 min to find the report, after which the trip to school 42.0 ...
*Sunday, September 8, 2013 at 4:22pm*

**Physics**

I have really been struggling with this one and have come up with a wide variety of answers. Any help would be great: If the radius of a planet is larger than that of Earth by a factor of 8.25, how much bigger is the surface area of the planet than Earth’s?
*Sunday, September 8, 2013 at 2:15pm*

**Physics**

I have really been struggling with this one and have come up with a wide variety of answers. Any help would be great: If the radius of a planet is larger than that of Earth by a factor of 8.25, how much bigger is the surface area of the planet than Earth’s?
*Sunday, September 8, 2013 at 2:09pm*

**Physics **

A projectile is fired with an initial velocity of v0 feet per second. The projectile can be pictured as being fired from the origin into the first quadrant, making an angle O with the positive x-axis. If there is no air resistance, then at t seconds the coordinates of the ...
*Sunday, September 8, 2013 at 11:37am*

**Physics**

An electron with a speed of 3.00X10^6 m/s moves into a uniform electric field of magnitude 1.00X10^3 N/C. The field lines are parallel to the electron’s velocity and pointing in the same direction as the velocity. How far does the electron travel before it is brought to ...
*Sunday, September 8, 2013 at 11:17am*

**physics**

A long, straight metal rod has a radius of 6.00 cm and a charge per unit length of 36.0 nC/m. Find the electric field at the following distances from the axis of the rod, where distances are measured perpendicular to the rod. (a) 1.50 cm N/C (direction) (b) 13.5 cm N/C (...
*Sunday, September 8, 2013 at 11:16am*

**physics**

A large, flat, horizontal sheet of charge has a charge per unit area of 2.05 µC/m2. Find the electric field just above the middle of the sheet.
*Sunday, September 8, 2013 at 11:14am*

**physics**

The charge per unit length on a long, straight filament is -87.0 µC/m. (a) Find the electric field 10.0 cm from the filament. Distances are measured perpendicular to the length of the filament. (Take radially inward toward the filament as the positive direction.) MN/C (b...
*Sunday, September 8, 2013 at 11:14am*

**PHYSICS**

The electric field everywhere on the surface of a thin, spherical shell of radius 0.710 m is measured to be 860 N/C and points radially toward the center of the sphere. (a) What is the net charge within the sphere's surface?nC (b) What can you conclude about the nature and...
*Sunday, September 8, 2013 at 11:13am*

**physics**

A 30.0 cm diameter loop is rotated in a uniform electric field until the position of maximum electric flux is found. The flux in this position is 5.60 multiplied by 105 N·m2/C. What is the magnitude of the electric field? MN/C
*Sunday, September 8, 2013 at 11:11am*

**Quantum physics**

docs(dot)google(dot)com/file/d/0B4uUFmATOigqbjAxU2tRNjVwa1E/edit?usp=sharing (a) What is the inner product of the 3rd row and 14th row of this matrix? b) What is the inner product of the 3rd row with itself? C) Suppose we have a quantum circuit that takes the input |0&...
*Sunday, September 8, 2013 at 6:28am*

**physics**

the angle of elevation to the tower is 30 degree and then moved towards the tower of a distance 20m.now thw angle of elevation is 60 degree.What is the height of the tower??plz help me:)
*Sunday, September 8, 2013 at 4:43am*

**Physics**

Two resistors connected in series have an equivalent resistance of 783.4 Ω. When they are connected in parallel, their equivalent resistance is 171.3 Ω. Find the resistance of each resistor. 1) small resistance (ohm) 2) large resistance (0hm)
*Sunday, September 8, 2013 at 1:54am*

**physics**

Sheena can row a boat at 3.13 mi/h in still water. She needs to cross a river that is 1.10 mi wide with a current flowing at 1.75 mi/h. Not having her calculator ready, she guesses that to go straight across, she should head 60.0° upstream. (a) What is her speed with ...
*Sunday, September 8, 2013 at 12:04am*

**Quantum physics**

If you Fourier sample the state 122√(|000>−|001>+|010>−|011>+|100>−|101>+|110>−|111>), which of the following states can be the outcome of your measurement? Select all that apply. 1. |000> 2. |001> 3. |...
*Saturday, September 7, 2013 at 11:47pm*

**Quantum physics**

1] Let |ψ⟩=(2+i/3)|0>−(2/3)|1>. If we measure |ψ⟩ in the basis |u⟩=(1+i/2)|0>+(1−i/2)|1>, |u⊥>=1−i/2|0>−1+i/2|1>, what is the probability our outcome is |u>? 2]Suppose we ...
*Saturday, September 7, 2013 at 11:45pm*

**Quantum physics**

1] Given qubit 1 in the state 35|0>+45|1> and qubit 2 in the state 12√|0>+i2√|1>, what is the state of the composite system? in form of a│00> + b│01> + c│10> + d│11> find a b c d. 2] Which of the following states is ...
*Saturday, September 7, 2013 at 11:41pm*

**physics**

determine the pressure of a 20 lb force is applied to an area of 10 inch squared
*Saturday, September 7, 2013 at 9:53pm*

**physics**

determine the pressure of a 20 lb force is applied to an area of 10 inch squared
*Saturday, September 7, 2013 at 9:43pm*

**Physics**

A soccer player kicks the ball toward a goal that is 27.0 m in front of him. The ball leaves his foot at a speed of 16.7 m/s and an angle of 36.0 ° above the ground. Find the speed of the ball when the goalie catches it in front of the net.
*Saturday, September 7, 2013 at 9:30pm*

**Physics**

A rocket is fired at a speed of 50.0 m/s from ground level, at an angle of 46.0 ° above the horizontal. The rocket is fired toward an 18.7-m high wall, which is located 23.0 m away. The rocket attains its launch speed in a negligibly short period of time, after which its ...
*Saturday, September 7, 2013 at 9:29pm*

**Physics**

In the absence of air resistance, a projectile is launched from and returns to ground level. It follows a trajectory similar to that shown in Figure 3.10 and has a range of 24 m. Suppose the launch speed is doubled, and the projectile is fired at the same angle above the ...
*Saturday, September 7, 2013 at 9:28pm*

**Physics**

A horizontal rifle is fired at a bull's-eye. The muzzle speed of the bullet is 660 m/s. The gun is pointed directly at the center of the bull's-eye, but the bullet strikes the target 0.029 m below the center. What is the horizontal distance between the end of the rifle...
*Saturday, September 7, 2013 at 9:24pm*

**Physics**

A puck is moving on an air hockey table. Relative to an x, y coordinate system at time t = 0 s, the x components of the puck's initial velocity and acceleration are v0x = +6.6 m/s and ax = +2.0 m/s2. The y components of the puck's initial velocity and acceleration are ...
*Saturday, September 7, 2013 at 9:23pm*

**Physics**

A volleyball is spiked so that it has an initial velocity of 16.6 m/s directed downward at an angle of 55.2 ° below the horizontal. What is the horizontal component of the ball's velocity when the opposing player fields the ball?
*Saturday, September 7, 2013 at 9:20pm*

**Physics**

The earth moves around the sun in a nearly circular orbit of radius 1.50 x 1011 m. During the three summer months (an elapsed time of 7.89 x 106 s), the earth moves one-fourth of the distance around the sun. (a) What is the average speed of the earth? (b) What is the magnitude...
*Saturday, September 7, 2013 at 9:19pm*

**Physics**

In diving to a depth of 979 m, an elephant seal also moves 104 m due east of his starting point. What is the magnitude of the seal's displacement?
*Saturday, September 7, 2013 at 9:19pm*

**Physics**

Suppose that the gravitational acceleration on a certain planet is only 3.1 m/s2. A space explorer standing on this planet throws a ball straight upward with an initial velocity of 35 m/s a) What is the velocity of the ball 4 seconds after it is thrown? m/s (b) How much time ...
*Saturday, September 7, 2013 at 6:46pm*

**Physics**

escalator that leads down into a subway station has a length of 27.0 m and a speed of 1.7 m/s relative to the ground. A student is coming out of the station by running in the wrong direction on this escalator. The local record time for this trick is 11 s. Relative to the ...
*Saturday, September 7, 2013 at 5:33pm*

**physics**

Two geological field teams are working in a remote area. A global positioning system (GPS) tracker at their base camp shows the location of the first team as 37 km away, 24° north of west, and the second team as 34 km away, 38° east of north. When the first team uses ...
*Saturday, September 7, 2013 at 4:31pm*

**physics**

Vector A ⃗ {\rm \vec A} points in the negative x x direction. Vector B ⃗ {\rm \vec B} points at an angle of 35.0 ∘ ^\circ above the positive x x axis. Vector C ⃗ {\rm \vec C} has a magnitude of 19m m and points in a direction 37.0 ∘ ^\circ below ...
*Saturday, September 7, 2013 at 4:21pm*

**Physics**

During takeoff, an airplane climbs with a speed of 110 m/s at an angle of 44 degrees above the horizontal. The speed and direction of the airplane constitute a vector quantity known as the velocity. The sun is shining directly overhead. How fast is the shadow of the plane ...
*Saturday, September 7, 2013 at 3:34pm*

**Physics**

As soon as a traffic light turns green, a car speeds up from rest to 45.0 mi/h with constant acceleration 8.50 mi/h/s. In the adjoining bike lane, a cyclist speeds up from rest to 15.0 mi/h with constant acceleration 12.50 mi/h/s. Each vehicle maintains constant velocity after...
*Saturday, September 7, 2013 at 2:55pm*

**Physics**

If = (6.00 -8.00 ) units, = (-8.00 + 3.00 ) units, and = (27.0 + 19.0 ) units, determine a and b such that a + b + = 0.
*Saturday, September 7, 2013 at 2:54pm*

**Physics**

If a person can jump a maximum horizontal distance (by using a 45° projection angle) of 2.07 m on Earth, what would be his maximum range on the Moon, where the free-fall acceleration is g/6 and g = 9.80 m/s2?
*Saturday, September 7, 2013 at 2:52pm*

**Physics**

Which is greater, an acceleration from 30 km/h to 40 km/h or an acceleration from 85 km/h to 93 km/h if both occur during the same time?
*Saturday, September 7, 2013 at 12:53pm*

**physics**

according to classical model of the H-atom,an electron moving in a circular orbit of 0.053 nm around the proton fixed at the center would be unstable and the electron should ultimately collapse to the proton. Estimate how long it would take for the electron to collapse into ...
*Saturday, September 7, 2013 at 9:25am*

**physics**

use bohr's quantization rule to calculate the energy levels of a hermonic oscillator, for which the energy is (p^2/2m) + (mw^2r^2/2) i.e. force is mw^2y. Restrict yourself to circular orbits.
*Saturday, September 7, 2013 at 9:11am*

**physics**

an electron of energy 100 mev collides with a photon of wavelength 3*10^6 nm.what is the maximum energy loss suffered by the electron..
*Saturday, September 7, 2013 at 9:02am*

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