Thursday

January 29, 2015

January 29, 2015

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**physics**

A driver drives 2.5 hours at an average speed of 48MPH. What distance does she travel in this time?
*Monday, February 10, 2014 at 1:01pm*

**physics**

A driver drives 2.5 hours at an average speed of 48MPH. What distance does she travel in this time?
*Monday, February 10, 2014 at 12:59pm*

**physics**

a projectile is thrown from the ground with an initial velocity of 20.0 m/s at an angle of 40.0 degrees above the horizontal. find the projectile's maximum height, the time required to reach its maximum height, its velocity at the top of the trajectory, the range of the ...
*Monday, February 10, 2014 at 12:32pm*

**Physics**

A fisherman is fishing from a bridge and is using a "49.0-N test line." In other words, the line will sustain a maximum force of 49.0 N without breaking. What is the weight of the heaviest fish that can be pulled up vertically, when the line is reeled in (a) at ...
*Monday, February 10, 2014 at 12:10pm*

**Physics**

A plane flies 407 km east from city A to city B in 44.0 min and then 871 km south from city B to city C in 1.90 h. For the total trip, what are the (a) magnitude (in km) and (b) direction of the plane's displacement, the (c) magnitude (in km/h) and (d) direction of its ...
*Monday, February 10, 2014 at 10:58am*

**physics**

Poissons equation for the yukawa potential is given by; Phi(r)=-(G*M exp(-alpha*r))/r what is the analogue of poissons equation for this potential.
*Monday, February 10, 2014 at 8:13am*

**physics**

A submarine dives from the water surface at an angle of 31° below the horizontal, following a straight path 75 m long. How far is the submarine then below the water surface? A)75 m B)(75 m)/sin 31° C)(75 m)sin 31° D)(75 m)cos 31° E)none of these answers
*Monday, February 10, 2014 at 1:08am*

**physics**

A submarine dives from the water surface at an angle of 31° below the horizontal, following a straight path 75 m long. How far is the submarine then below the water surface?
*Monday, February 10, 2014 at 1:07am*

**physics**

A spider crawling across a table leaps onto a magazine blocking its path. The initial velocity of the spider is 0.840 m/s at an angle of 36.0° above the table, and it lands on the magazine 0.0710 s after leaving the table. Ignore air resistance. How thick is the magazine? ...
*Sunday, February 9, 2014 at 10:38pm*

**physics**

What is the maximum amplitude of the resultant waves at the position of 2 . 7 m along the x -axis?
*Sunday, February 9, 2014 at 10:32pm*

**Physics**

suppose you are standing on the edge of a cliff 400 m high and you throw 2 balls in the air: one (ball a) directly upward with a speed of 17.6 m/s and one (Ball b) directly downward with a speed 17.6 m/s. 1.) how high will ball A rise? 2.) How long will it take Ball A to reach...
*Sunday, February 9, 2014 at 9:07pm*

**Physics**

Police find skid marks 60 m long on a road showing where a car made an emergency stop. Assuming that the deceleration was -10m/s2, how fast was the car going?
*Sunday, February 9, 2014 at 8:50pm*

**physics**

f the vertical initial speed of the ball is 4.0m/s as the cannon moves horizontally at a speed of 0.70m/s , how far from the launch point does the ball fall back into the cannon? What would happen if the cannon were accelerating?
*Sunday, February 9, 2014 at 8:44pm*

**Physics**

suppose you are standing on the edge of a cliff 400 m high and you throw 2 balls in the air: one (ball a) directly upward with a speed of 17.6 m/s and one (Ball b) directly downward with a speed 17.6 m/s. 1.) how high will ball A rise? 2.) How long will it take Ball A to reach...
*Sunday, February 9, 2014 at 8:36pm*

**Physics**

You buy yourself a new Lamborghini which can accelerate from 0 to 62 mph in 2.5 seconds. 1.) what is the magnitude of the car's acceleration in SI units? 2.)the latest figures on speeding related car accident fatalities show 32788 deaths per year in the united states. in ...
*Sunday, February 9, 2014 at 8:31pm*

**physics**

Buffy is rolling along in her 12.7 kg wagon at 3.6 m/s (in the positive direction) when she jumps off the back. She continues to move forward at 1.2 m/s relative to the ground. This causes her wagon to go speeding forward at 9.51 m/s relative to the ground. How much does Buffy...
*Sunday, February 9, 2014 at 8:12pm*

**physics**

You have a coil with 20 loops inside a magnetic field generator that is temporarily generating a field that has a rate of change of -0.25. The other end of this coil is wrapped around a core with 15 turns. How many turns must a second coil wrapped around the same coil have to ...
*Sunday, February 9, 2014 at 8:08pm*

**physics**

Buffy is rolling along in her 11.1 kg wagon at 4.6 m/s (in the positive direction) when she jumps off the back. She continues to move forward at 1.5 m/s relative to the ground. This causes her wagon to go speeding forward at 13.03 m/s relative to the ground. How much does ...
*Sunday, February 9, 2014 at 8:07pm*

**physics**

A man is in a boat out away from shore. Th mass of the man, the boat and everything in it is 210 kg. The boat is not moving. The man throws and anchor with a mass of 26 kg straight out from the boat with a speed of 6.6 m/s. What is the resulting speed of the boat?
*Sunday, February 9, 2014 at 8:06pm*

**Physics**

If a salmon swims straight upward in the water fast enough to break through the surface at a speed of 5 meters per second, how high can it jump above water?
*Sunday, February 9, 2014 at 7:52pm*

**Physics**

You're driving down the highway at 20m/s when you see a dog you don't want to crush it 35 m in front of you. Your reaction time before stepping on the brakes is 0.5s, and acceleration created by your brakes is 10 m/s^2 what was the distance travelled before coming to a...
*Sunday, February 9, 2014 at 7:38pm*

**Physics**

You're driving down the highway at 20m/s when you see a dog you don't want to crush it 35 m in front of you. Your reaction time before stepping on the brakes is 0.5s, and acceleration created by your brakes is 10 m/s^2 what was the distance travelled before coming to a...
*Sunday, February 9, 2014 at 7:38pm*

**Physics**

A sand bag is dropped out of a balloon traveling upward at speed of 2.3m/s. A kiddo drops a bag at the instant the balloon is 34m above the ground. How long does it take the sand bag to hit the ground? I got -2.41s why?
*Sunday, February 9, 2014 at 7:29pm*

**Physics**

A motorist drives north for 33.0 minutes at 77.0 km/h and then stops for 15.0 minutes. He then continues north, traveling 130 km in 1.80 h. a) What is his total displacement in km? b) What is his average velocity km/h?
*Sunday, February 9, 2014 at 7:24pm*

**physics**

A block of wood with a mass of 4.62 kg sits on the edge of a table that is 0.99 m tall. A bullet with a mass of 70.5 g traveling with a speed of 450 m/s is shot into the block and is lodged in it. Assuming that no energy is lost to friction, how far from the table will the ...
*Sunday, February 9, 2014 at 7:12pm*

**physics**

A balistic pendulum is made from a block of wood with a mass of 2.78 kg. A bullet with a mass of 39 g is shot into the block causing it to rise 29.1 cm. What was the speed of the bullet?
*Sunday, February 9, 2014 at 7:10pm*

**physics**

passenger in a moving car and a passerby standing at the road side see each other as moving in the opposite direction. Which of the following is NOT true? The passenger is in motion relative to the passer-by The passer-by is stationary relative to the passenger Both observers ...
*Sunday, February 9, 2014 at 7:09pm*

**Physics**

You are driving through town at 12m/s when suddenly a ball rolls out aim front of you. You apply the brakes and begin decelerating at 4ms^2. How long does it take you to stop? The answer I got is -3 is that possible!!!!??! I'm not sure what doing wrong.
*Sunday, February 9, 2014 at 7:02pm*

**Physics **

Can an object with constant acceleration reverse it's direction of travel? I think it's yes because when a ball is thrown in the air it has a constant acceleration of gravity and the acceleration continues when it reverses it's direction. Am I right??
*Sunday, February 9, 2014 at 6:55pm*

**physics**

A cue ball initially moving at 2.6 m/s strikes a stationary eight ball of the same size and mass. After the collision, the cue ball’s ﬁnal speed is 1.3 m/s.Find the cue ball’s angle θ with respect to its original line of motion. Consider this to be an ...
*Sunday, February 9, 2014 at 5:41pm*

**physics 1**

Only two forces act on an object (mass=4.00 kg), as in the drawing. Find (a) the magnitude and (b) the direction (relative to the x axis) of the acceleration of the object.
*Sunday, February 9, 2014 at 5:12pm*

**Physics**

A particle moves according to the equation x= (10 m/s^2)t^2 where x is in meters and t is in seconds. a. Find the average velocity for the time interval from t1= 2.38 s to t2= 4.3 s. Answer in units of m/s. b. Find the average velocity for the time interval from t1= 2.38 s to ...
*Sunday, February 9, 2014 at 4:48pm*

**physics**

a stone is thrown vertically upward with a speed of 10.5 m/s from the edge of a cliff 76.0 m high. how much later does it reach the bottom of cliff? what is its speed just before hitting? what total distance did it travel
*Sunday, February 9, 2014 at 4:43pm*

**Physics**

A ball thrown straight up at ground level passes a height of 115.7 m in 5.6 s. The acceleration of gravity is 9.8 m/s^2. What was its initial speed? Answer in units of m/s.
*Sunday, February 9, 2014 at 4:41pm*

**Physics**

A golf ball is released from rest from the top of a very tall building. Choose a coordinate system whose origin is at the starting point of the ball, and whose y axis points vertically upward. The acceleration of gravity is 9.8 m/s^2. a.Neglecting air resistance, calculate the...
*Sunday, February 9, 2014 at 4:38pm*

**physics**

If the vertical initial speed of the ball is 4.0m/s as the cannon moves horizontally at a speed of 0.70m/s , how far from the launch point does the ball fall back into the cannon? What would happen if the cannon were accelerating?
*Sunday, February 9, 2014 at 2:06pm*

**physics**

A person riding in the back of a pickup truck traveling at 60km/h on a straight, level road throws a ball with a speed of 10km/h relative to the truck in the direction of the truck's motion.What is the velocity of the ball relative to a stationary observer by the side of ...
*Sunday, February 9, 2014 at 2:04pm*

**science/physics**

If a pendulum is not pushed, why does it not go as big when it swings back. Where does the lost PE go? ans. Since there is no force applied to the pendulum there is not enough Kinetic energy (energy of motion) to transform into potential energy to make it swing back. The ...
*Sunday, February 9, 2014 at 1:19pm*

**physics/science**

If a pendulum is not pushed, why does it not go as big when it swings back. Where does the lost PE go? ans. Since there is no force applied to the pendulum there is not enough Kinetic energy (energy of motion) to transform into potential energy to make it swing back. The ...
*Sunday, February 9, 2014 at 10:41am*

**Physics**

a vector with a magnitude of 17.6 m is directed at angle θ = 43o counterclockwise from the +x axis. What are the components (a) ax and (b) ay of the vector? A second coordinate system is inclined by angle θ' = 20o with respect to the first. What are the ...
*Sunday, February 9, 2014 at 6:17am*

**Physics**

A train at a constant 41.0 km/h moves east for 28 min, then in a direction 53.0° east of due north for 15.0 min, and then west for 64.0 min. What are the (a) magnitude (in km/h) and (b) angle (relative to north, with east of north positive and west of north negative) of ...
*Sunday, February 9, 2014 at 6:16am*

**Physics**

A plane flies 407 km east from city A to city B in 44.0 min and then 871 km south from city B to city C in 1.90 h. For the total trip, what are the (a) magnitude (in km) and (b) direction of the plane's displacement, the (c) magnitude (in km/h) and (d) direction of its ...
*Sunday, February 9, 2014 at 6:15am*

**Physics**

A calorimeter with specific heat of 490x10^2J/kg^1K^1 has a mass of 2.00x10^-1kg that contains 3.00x10^-1kg of liquid water at 40C. If 5.00x10^-2kg of ice at 0C is dropped into the water. Find the final temperature of the mixture where the ice has melted is 23.8C. Calculate ...
*Sunday, February 9, 2014 at 2:41am*

**physics 2 for college**

a jet propelled motorcycle start from rest moves in a straightline with constant acceleration and covers a distance of 64m in 4seconds.?
*Sunday, February 9, 2014 at 1:05am*

**Physics**

Three vectors are given by a= 0i+0j+4.0k , b= 3.0i+ -3.0j+-1.0k and c=1.0i+2.0j+-1.0k. Find (a) a(bxc) and (b)a(b+c)
*Sunday, February 9, 2014 at 12:17am*

**Physics**

For the vectors with a = 3.3 and b = 2.2, what are (a) the z component of AxB, (b) the z component of AxC, and (c) the z component of BxC?
*Sunday, February 9, 2014 at 12:15am*

**Physics**

A vector with a magnitude of 17.6 m is directed at angle θ = 43o counterclockwise from the +x axis. What are the components (a) ax and (b) ay of the vector? A second coordinate system is inclined by angle θ' = 20o with respect to the first. What are the ...
*Sunday, February 9, 2014 at 12:13am*

**Physics**

In the sum A+B=C, vector A has a magnitude of 10.2 m and is angled 48.0° counterclockwise from the +x direction, and vector C has a magnitude of 15.0 m and is angled 22.0° counterclockwise from the -x direction. What are (a) the magnitude and (b) the angle (relative to...
*Sunday, February 9, 2014 at 12:13am*

**Physics**

Oasis B is a distance d = 7.0 km east of oasis A, along the x axis shown in the figure. A confused camel, intending to walk directly from A to B instead walks a distance W1 = 22 km west of due south by angle θ1 = 15.0°. It then walks a distance W2 = 34 km due north. ...
*Sunday, February 9, 2014 at 12:11am*

**Physics**

A boat takes 2.0hr {\rm hr} to travel 26km {\rm km} down a river, then 6.0hr {\rm hr} to return.
*Sunday, February 9, 2014 at 12:06am*

**Physics**

A boat takes 2.0hr {\rm hr} to travel 26km {\rm km} down a river, then 6.0hr {\rm hr} to return.
*Sunday, February 9, 2014 at 12:04am*

**Physics **

A jet plane has a takeoff speed of Vto=125km/h (34.72 m/s) and it's engines can power it to accelerate with an average acceleration of 5.6 m/s^2. A.) what length of runway will it need to take off safely? B.) suppose it had an available runway length of only 75m. What ...
*Saturday, February 8, 2014 at 10:01pm*

**physics**

A car is moving down a highway at -15 m/s and accelerating at 3 m/s^2. If it's initial position is at x = 0 m where will it be after 3 seconds?
*Saturday, February 8, 2014 at 9:52pm*

**Physics**

Sound is emitted by a point source. You wish to compare the sound intensity and sound intensity level from this source at two different sites. If the distance to the second site is a factor of 6 greater than the distance to the first, determine the following. (a) Determine the...
*Saturday, February 8, 2014 at 8:44pm*

**Physics**

Sound is emitted by a point source. You wish to compare the sound intensity and sound intensity level from this source at two different sites. If the distance to the second site is a factor of 6 greater than the distance to the first, determine the following. (a) Determine the...
*Saturday, February 8, 2014 at 7:16pm*

**Physics**

18 cars in a circle at a boom box competition produce a 105 dB sound level at the center of the circle. What is the average sound level produced there by each, assuming interference effects can be neglected? dB = ?
*Saturday, February 8, 2014 at 7:15pm*

**physics**

a bead on a wire 30m high is released and reaches point A, where is loops twice towards the right. what is the velocity and acceleration at point A-D? point A is at 20m directly below from starting point. Point B is 10m at the bottom of the first loop. point C is in between ...
*Saturday, February 8, 2014 at 7:06pm*

**Physics**

The only force acting on a 4.7 kg body as it moves along the positive x axis has an x component Fx = -6x N, where x is in meters. The velocity of the body at x = 2.4 m is 11 m/s. (a) What is the velocity of the body at x = 4.9 m? (b) At what positive value of x will the body ...
*Saturday, February 8, 2014 at 6:51pm*

**Physics**

Two cars pass a school when a stopwatch reads zero. They both travel in the same direction. Car A travels at a constant speed of 98 km/h and Car B travels at 64 km/h. How many meters apart are the two cars when the stopwatch reads 2.0 hours?
*Saturday, February 8, 2014 at 4:23pm*

**Physics**

What is the minimum uncertainty in the velocity of an electron that is known to be somewhere between 0.050 nm and 0.10 nm from a proton
*Saturday, February 8, 2014 at 4:15pm*

**Physics**

The energy of the first excited state of a hydrogen atom is -0.34 eV ± 0.0003 eV. What is the average lifetime of for this state?
*Saturday, February 8, 2014 at 4:11pm*

**Physics**

A trash can with a mass of 5 kg has a coefficient of static friction of μs = 0.80 and a coefficient of kinetic friction of μk = 0.22. (The Active Figure applies to a similar situation, but the values of the mass, coefficient of static friction and coefficient of ...
*Saturday, February 8, 2014 at 3:43pm*

**Physics**

Charges of −q and +2q are fixed in place, with a distance of 4.65 m between them. A dashed line is drawn through the negative charge, perpendicular to the line between the charges. On the dashed line, at a distance L from the negative charge, there is at least one spot ...
*Saturday, February 8, 2014 at 11:52am*

**physics**

Suppose electrons enter a uniform electric field midway between two plates at an angle ¦È0 to the horizontal, as shown in the figure
*Saturday, February 8, 2014 at 11:42am*

**Physics**

You and a friend each drive 54 km. You travel at 95 km/h; your friend travels at 118 km/h. How many minutes will your friend have to wait for you at the end of the trip?
*Saturday, February 8, 2014 at 11:35am*

**physics**

Two identical weights of mass M are linked by a thread wrapped around a frictionless pulley with a fixed axis. A small weight of mass ‘m’ is placed on one of the weights. What is reaction force between m and M?
*Saturday, February 8, 2014 at 11:05am*

**physics**

2 tall buildings are 200m apart. with what speed a ball be thrown horizontally from a window of one building 2km above the ground so that it will enter a window 40m from the ground in the other?
*Saturday, February 8, 2014 at 2:40am*

**physics**

a block of wood of 200g is thrown vetically with a veloncity of 20mls what is the pontential energy?
*Saturday, February 8, 2014 at 12:29am*

**Physics Help, check work?**

A running track consists of two straight 88.5m segments and two semicircles of radius 39.0m as shown in the figure. Part A was finding the distance a runner travels in one complete lap. d= 422 m. No problem. Then part B asks for the displacement in x, y components of a runner ...
*Friday, February 7, 2014 at 8:47pm*

**physics**

What is the resistance of a 7.4-m length of copper wire 1.2mm in diameter? The resistivity of copper is 1.68×10−8Ω⋅m. R=_________
*Friday, February 7, 2014 at 8:30pm*

**physics**

A constant voltage is applied across a circuit. If the resistance in the circuit is doubled, what is the effect on the power dissipated by the circuit? a. The power dissipated is reduced by a factor of 4. b. The power dissipated is quadrupled. c. The power dissipated is ...
*Friday, February 7, 2014 at 8:28pm*

**physics**

Consider two copper wires with the same cross-sectional area. Wire A is twice as long as wire B. How do the resistivities and resistances of the two wires compare? CHECK ALL THAT APPLY Wire A and wire B have the same resistance. Wire A has twice the resistivity of wire B. Wire...
*Friday, February 7, 2014 at 8:27pm*

**college physics 2**

A current of 2.10A flows in a wire. How many electrons are flowing past any point in the wire per second? N=________________________ electrons/s
*Friday, February 7, 2014 at 8:24pm*

**Physics**

You're driving down the highway at 20m/s when you see a snowman you don't want to crush 35 m in front of you. Your reaction time before stepping on the brakes is 0.5s, and acceleration created by your brakes is 10 m/s^2 what was the distance travelled before coming to ...
*Friday, February 7, 2014 at 7:21pm*

**physics**

A passenger in a helicopter traveling upwards at 20 m/s accidentally drops a package out the window. If it takes 8 seconds to reach the ground, how high to the nearest meter was the helicopter when the package was dropped?
*Friday, February 7, 2014 at 5:09pm*

**Physics**

Landing with a speed of 90 m/s In the x direction a jet come to rest at 1 km. assuming the jet slows down with constant acceleration find the magnitude of it's acceleration. Is there anyway someone could break this down step by step??
*Friday, February 7, 2014 at 5:01pm*

**PHYSICS**

A car traveling at 17 m/s accelerates at 1.37 m/s2 for 12 seconds. To the nearest meter how far does it travel?
*Friday, February 7, 2014 at 5:00pm*

**physics**

A runner dashes from the starting line (x = 0) to a point 127 m away and then turns around and runs to a point 38 m away from the starting point in 13 seconds. To the nearest tenth of a m/s what is the average speed? What is the runner's average velocity in the previous ...
*Friday, February 7, 2014 at 4:58pm*

**physics**

How far to the nearest tenth of a meter can a runner running at 10 m/s run in the time it takes a rock to fall from rest 99 meters? Which is: (127m+89m)/13s= 216m/13s= 16.7m/s But, the second part of the problem is: What is the runner's average velocity? Which I'm not ...
*Friday, February 7, 2014 at 4:48pm*

**physics**

How far to the nearest tenth of a meter can a runner running at 10 m/s run in the time it takes a rock to fall from rest 99 meters?
*Friday, February 7, 2014 at 4:33pm*

**physics**

Two buses leave downtown one is headed southwest the other is headed northeast. Do they have the same velocity? Why or why not?
*Friday, February 7, 2014 at 4:29pm*

**physics**

A person riding in the back of a pickup truck traveling at 60km/h on a straight, level road throws a ball with a speed of 10km/h relative to the truck in the direction of the truck's motion.
*Friday, February 7, 2014 at 4:28pm*

**physics**

If the vertical initial speed of the ball is 4.0m/s as the cannon moves horizontally at a speed of 0.70m/s , how far from the launch point does the ball fall back into the cannon?
*Friday, February 7, 2014 at 4:24pm*

**physics**

A speeder traveling at 30 m/s passes a motorcycle policeman at rest at the side of the road. The policeman accelerates at 2.4 m/s2. To the nearest tenth of a second how long does it take the policeman to catch the speeder?
*Friday, February 7, 2014 at 4:16pm*

**Physics**

An ice chest at a beach party contains 12 cans of soda at 4.16 °C. Each can of soda has a mass of 0.35 kg and a specific heat capacity of 3800 J/(kg C°). Someone adds a 8.48-kg watermelon at 25.7 °C to the chest. The specific heat capacity of watermelon is nearly ...
*Friday, February 7, 2014 at 4:13pm*

**Physics**

Ball A is thrown straight down off the top of a tall building with an initial velocity of 20m/s. Ball b is thrown straight up from the top of the same building with initial velocity of 20 m/s. Which ball, if either, experiences the greater acceleration after leaving the ...
*Friday, February 7, 2014 at 3:21pm*

**Physics**

An aluminum can is filled to the brim with a liquid. The can and the liquid are heated so their temperatures change by the same amount. The can’s initial volume at 8 °C is 3.5 × 10-4 m3. The coefficient of volume expansion for aluminum is 69 × 10-6 (C°...
*Friday, February 7, 2014 at 2:56pm*

**physics**

One gram of nickel has 1.026 × 1022 atoms, and each nickel atom has 28 electrons. How many electrons are contained in 6.00 g of nickel? The elemental charge is 1.6 × 10−19 C. Answer in units of electrons
*Friday, February 7, 2014 at 2:52pm*

**Physics**

A dockworker applies a constant horizontal force of 73.0N to a block of ice on a smooth horizontal floor. The frictional force is negligible. The block starts from rest and moves a distance 11.5m in a time 5.40s . a.) What is the mass of the block? b.)If the worker stops ...
*Friday, February 7, 2014 at 2:37pm*

**physics**

A wire 1m long and weighting 5 gm is stretched by a tension of 4kg wt. When sounded, it is found to vibrate in two loops. Calculate the frequency of the note emitted by the wire.
*Friday, February 7, 2014 at 8:49am*

**physics**

Q. A 200 kg load is suspended by a cable from a crane . Two ropes are attached to the load , acting at 90 deg to each other. One rope exerts a pull of 220 N , at 10 deg below horizontal, the other rope exerts a force of 360 N at 15 deg below horizontal. Calculate 1)tension in ...
*Friday, February 7, 2014 at 6:03am*

**physics**

A ball is thrown straight upward from ground level. At what speed must the ball be thrown if it is to reach a maximum height 21 meters above the ground?
*Friday, February 7, 2014 at 3:30am*

**Physics**

You pick up a 2.5kg can of paint from the ground and lift it to a height of 1.7m .How much work do you do on the can of paint? You hold the can stationary for half a minute, waiting for a friend on a ladder to take it. How much work do you do during this time?
*Friday, February 7, 2014 at 2:59am*

**physics**

he x-component of a velocity vector that has an angle of 44∘ to the +x-axis has a magnitude of 4.3m/s . What is the magnetude velocity?
*Friday, February 7, 2014 at 1:32am*

**physics**

wo cars approach each other on a straight, level highway. Car A travels at 60 km/h and car B at 80 km/h. The driver of car B sees car A approaching at a speed of ________. Two cars approach each other on a straight, level highway. Car A travels at 60 and car B at 80 . The ...
*Friday, February 7, 2014 at 12:44am*

**physics**

Water of density 1000 kg/m3 falls without splashing at a rate of 0.241 L/s from a height of 81.3 m into a 0.638 kg bucket on a scale. If the bucket is originally empty, what does the scale read 2.06 seconds after the first drop contacts the bucket? The acceleration due to ...
*Thursday, February 6, 2014 at 10:59pm*

**Physics**

) The energy of the first excited state of a hydrogen atom is -0.34 eV ± 0.0003 eV. What is the average lifetime of for this state?
*Thursday, February 6, 2014 at 10:46pm*

**Physics**

A student is doing the egg blast lab. Their egg blast device has a total mass of 0.20 kg. It fires off of the launcher at 26 m/s. The egg hits the wall, splatters, and stays stuck to the wall. Find the total impulse on the egg.
*Thursday, February 6, 2014 at 9:46pm*

**physics**

A proton, initially traveling in the +x-direction with a speed of 6.00×105m/s , enters a uniform electric field directed vertically upward. After traveling in this field for 4.38×10−7s , the proton’s velocity is directed 45 ∘ above the +x-axis.
*Thursday, February 6, 2014 at 9:16pm*

**physics**

a 65kg person dives into the water from the 10m platform. she comes to a stop 2m below the surface of the water. what net force did the water exert on the swimmer? so for the net force i got -2548N i know: vf^2=vi^2 + 2ad vf^2 = 0 + 2(9.8)(10) vf^2 = 196 vf=14m/s therefore to ...
*Thursday, February 6, 2014 at 7:34pm*

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