Saturday

October 22, 2016
**Physics**

A long jump athlete take off at 25 degree with the horizo and achieves a jumping distance of 9.12 m. (i) calculate the initial take-off speed (ii) calculate the maximum height of the jump.

*Saturday, July 4, 2015 by Hannah*

**physics**

A 1500kg car moving at a speed of 20 m/s comes to a halt. How much work was done by the brakes? How fast can a 2.0 horsepower motor lift a 200 kg mass? A boy with a mass of 20 kg is riding on a 10 kg cart which is travelling at 3 m/s. He jumps off in such a way that he lands ...

*Friday, July 3, 2015 by G*

**Physics**

A 2000 kg car pushes a 3000 kg truck that has a dead battery. The ground pushes forward on the car with a force of 6000 N. What is the magnitude of the force that the truck exerts on the car? Ignore any friction forces. My work/attempts: I've drawn a for body diagram for ...

*Friday, July 3, 2015 by Ashley*

**physics**

An oil gusher shoots crude oil 29.0 m into the air through a 0.100 m diameter pipe. Neglecting air resistance but not the resistance of the pipe, and assuming laminar flow, calculate the pressure at the entrance of the 55.0 m long vertical pipe. Take the density of the oil to ...

*Friday, July 3, 2015 by Uri*

**physics**

Concrete is pumped from a cement mixer to the place it is being laid, instead of being carried in wheelbarrows. The flow rate is 250 L/min through a 50.0 m long, 8.00 cm diameter hose, and the pressure at the pump is 8.50 ✕ 106 N/m2 (about 1200 psi). (a) Calculate the ...

*Friday, July 3, 2015 by Uri*

**Physics**

Suppose you measure a standing person's blood pressure by placing the cuff on his leg 0.470 m below the heart. Calculate the pressures you would observe if the pressures at the heart are 119 over 80 mm Hg. Assume there is no loss of pressure due to resistance in the ...

*Friday, July 3, 2015 by Uri*

**physics**

A mass m = 9.0 kg is attached to the lower end of a massless string of length L = 83.0 cm. The upper end of the string is held fixed. Suppose that the mass moves in a circle at constant speed, and that the string makes an angle theta = 21 with the vertical, as shown in the ...

*Friday, July 3, 2015 by sam*

**Physics **

Water flows out horizontalmy at the end of a pipe at a height of 52 cm from the floor.If the horizontal distance before it hits the floor is 100 cm,calculate the velocity of the water at the instant it leaves the pipes?

*Friday, July 3, 2015 by Hannah*

**Physics**

Explain what is meant by i) free oscillation ii) damped oscillation iii) forced oscillation iv) resonance.

*Friday, July 3, 2015 by Tavashto*

**physics**

what work is done in raising a 3.0 kg mass from a 2.5 m high ledge to a 6.5 m high shelf? How much potential energy (Ep) does the mass now posses? Ok so for part 1 its w = m g h w = (3.0kg)(10m/s^2)(6.5m-2.5m) w = 120J now how do you find the potential energy?

*Friday, July 3, 2015 by G*

**physics**

Physics Genius! please let me! Three objects lie in the x, y plane. Each rotates about the z axis with an angular speed of 6.12 rad/s. The mass m of each object and its perpendicular distance r from the z axis are as follows: (1) m1 = 6.36 kg and r1 = 2.20 m, (2) m2 = 3.92 kg ...

*Thursday, July 2, 2015 by Lola*

**physics**

A ladder (ℓL = 7.50 m) of weight WL = 350 N leans against a smooth vertical wall. The term "smooth" means that the wall can exert only a normal force directed perpendicular to the wall and cannot exert a frictional force parallel to it. A firefighter, whose ...

*Thursday, July 2, 2015 by Lola*

**Algebra**

70 students are studying mathematics,physics & chemistry.40 students study mathematics,35 study physics and 30 study chemistry.15 students are studying all the three subjects.How many students are studying exactly two of the subjects

*Thursday, July 2, 2015 by Anika*

**physics**

the first law of thermodynamics can be expressed with the equation ΔU=ΔQ+ΔW where ΔU is the change of internal energy,ΔQ is the heat supplied to the system. Apply the first law to the brakes of a train as the brakes are applied and the train ...

*Thursday, July 2, 2015 by micheal*

**Physics**

Uugghhh help please. The velocity of a 4.6 kg particle is given by vector v=(4t{i}+7t^2{j}), where v is in m/s and t is in seconds. At the instant when the net force on the particle has a magnitude of 40 N, what is the angle between the particle's acceleration and the ...

*Thursday, July 2, 2015 by Jesus*

**Physics**

A sphere of mass 3.75 grams is suspended from a cord. A steady horizontal breeze pushes the sphere so that the cord makes a constant angle of 32.9° with the vertical. Find the magnitude of the push from the breeze. Answer in Newtons. I know that there are 2 forces acting ...

*Thursday, July 2, 2015 by Mister R*

**Physics**

Two blocks are in contact on a horizontal, frictionless table. Block 1 has a mass of 4.39 kg and block 2 has a mass of 2.59 kg. A horizontal force of magnitude 8.25 N is applied to the one of the blocks. Find the magnitude of the force between the blocks (a) if the given force...

*Thursday, July 2, 2015 by Angela R*

**Physics**

Block A has a mass of 4.11 kg and block B has a mass of 5.1 kg. The blocks are connected by a string of negligible mass and are free to slide on a horizontal, frictionless surface. A force vectorA=(11.1 N)i is applied to block A and a force vectorB=(24.6 N)i is applied to ...

*Thursday, July 2, 2015 by Natasha M.*

**physics**

Explain how it is possible for a motorcycle (mass = 250 kg) to have the same momentum as a locomotive engine (mass = 2,500 kg) i though momentum was directly proportional to mass so the more mass the more the momentum? how is it possible then?

*Wednesday, July 1, 2015 by K*

**physics**

A ball (mass 12 kg) moving at 15 m/s in the +x-direction collides with a ball (mass 36 kg) moving at 5.0 m/s in the +y direction. After colliding, the 12-kg ball moves at 6.0 m/s at an angle of 30°above the +x direction. Afterward, what is the speed and direction of the 36...

*Wednesday, July 1, 2015 by K*

**physics**

A water-balloon launcher with mass 5 kg fires a 1 kg balloon with a velocity of 8 m/s to the east. What is the recoil velocity of the launcher?

*Tuesday, June 30, 2015 by kari*

**Physics 12-grade**

Find out if the force is conservative or non-conservative if the work done is W = x^2.y - x.z^3 - z.

*Tuesday, June 30, 2015 by jzee11*

**statistics **

34. Two students (say A, and B) are challenged to solve a problem in statistics. Suppose that the probability that A will solve the problem is 40%, the probability that B will solve the problem is 55%, and the probability that A or B will solve the problem is 25%. The ...

*Tuesday, June 30, 2015 by meri*

**Physics**

A Particle moving with uniform acceleration is found to travel 35m in the 8th second and 51m in the 9th second. its velocity in m/sec at the beginning of 11 seconds is a> 49 b> 45 c> 47 d> 51

*Tuesday, June 30, 2015 by ChuLbuLi*

**PHYSICS**

'show that a 2.5m length of wire with cross section area 0f 1.0mm and resistance of 0.75ohms has a resistivity o f 3.0 ×10-7'

*Tuesday, June 30, 2015 by JOHN*

**experiment physics**

experiment vector and addition. is it necessary to label the first load ? explain

*Tuesday, June 30, 2015 by wowoo*

**experiment physics**

how would the result change if the angle of the third load in second experiment increased ? state the differences

*Tuesday, June 30, 2015 by wowoo*

**physics**

A solid uniform cylinder of mass 4.6 kg and radius 0.051 m rolls without slipping at a speed of 0.78 m/s. What is the cylinder’s total kinetic energy? please show some work so that I can learn from it.

*Monday, June 29, 2015 by chad*

**physics**

A child pushes a merry-go-round with a force of 80.0 N at an angle tangent to the circle (that is, perpendicular to a radius). If the child pushes it through exactly one full circle, and the merry-go-round has a radius of 1.15 m, how much work does she do? If you could please ...

*Monday, June 29, 2015 by chad*

**physics**

Last two problems on the homework! please help with these 2. it helps when detailed explanations are given! thanks A 2 kg ball is thrown horizontally, at 5m/s, from a height of 5 m. How fast will it be moving when it contacts the ground? A 70 kg pole-vaulter converts the ...

*Monday, June 29, 2015 by 1*

**physics**

a battery of three cell is series each of emf two volt and internal resistant 0.5 ohms is connected to a two ohm resistor in series with a parallel combination of 2.3 ohms resistor draw the circuit diagram and calculate effective external resistance effective resistance in the...

*Monday, June 29, 2015 by violet*

**Physics**

A parachutist bails out and freely falls 59.7 m. Then the parachute opens and thereafter she decelerates at 1.60 m/s2. She reaches the ground with a speed of 3.41 m/s. What is her average speed (in m/s) for the fall?

*Monday, June 29, 2015 by Natasha M.*

**Physics**

A motorcyclist who is moving along an x-axis has an acceleration given by a=(6.60-2.29t) for 0 >= t <= 6.0 s, where a is in m/s2 and t is in seconds. At t = 0, the velocity and position of the cyclist are 3.20 m/s and 7.30 m. For the time interval from 0 >= t <= 6....

*Monday, June 29, 2015 by Jessica*

**Physics**

A model rocket is fired vertically from the ground with a constant acceleration of 44.3 m/s2 for 1.95 s at which time its fuel is exhausted. What is the maximum height (in m) reached by the rocket? Shouldn't this just be d=rt? 44.3(1.95), but I'm not getting the right ...

*Monday, June 29, 2015 by Rachel*

**Physics**

A motorcyclist who is moving along an x-axis has an acceleration given by a=(6.47-2.15t) for 0 >= t <= 6.0 s, where a is in m/s2 and t is in seconds. At t = 0, the velocity and position of the cyclist are 3.20 m/s and 7.30 m. For the time interval from 0 >= t <= 6....

*Monday, June 29, 2015 by Jake*

**Physics**

A parachutist bails out and freely falls 64.7 m. Then the parachute opens and thereafter she decelerates at 1.88 m/s2. She reaches the ground with a speed of 3.07 m/s. What is her average speed (in m/s) for the fall? I was planning on finding the time before she decelerated ...

*Monday, June 29, 2015 by Ralph*

**Physics 2**

calculate the final temperature of a 400g of water at 80 degree celsius if it is poured into a 100g pot at 30 degree celsius. note: c of pot is 840 J/kg degree celsius.

*Monday, June 29, 2015 by Kaye*

**physics 1401**

a 15kg crate initially at rest slides down a ramp 2m long and inclined at an angle of 20 degrees with the horizontal. If there is no friction between the ramp surface and crate, what is the velocity of the crate at the bottom of the ramp?

*Sunday, June 28, 2015 by jcarrington*

**physics**

A motorcyclist is traveling along a road and accelerates for 4.45 s to pass another cyclist. The angular acceleration of each wheel is +6.35 rad/s2, and, just after passing, the angular velocity of each wheel is +75.6 rad/s, where the plus signs indicate counterclockwise ...

*Sunday, June 28, 2015 by Lola*

**physics**

The drive propeller of a ship starts from rest and accelerates at 2.95 10-3 rad/s2 for 2.05 103 s. For the next 1.90 103 s the propeller rotates at a constant angular speed. Then it decelerates at 2.30 10-3 rad/s2 until it slows (without reversing direction) to an angular ...

*Sunday, June 28, 2015 by Lola*

**physics help**

how much work must be done to raise a 5kg block of steel from the ground to a height of 2m (in Joules) in the absence of friction?

*Sunday, June 28, 2015 by jcarrington*

**Physics**

A car, moving along a straight stretch of highway, begins to accelerate at 0.0442 m/s^2. It takes the car 30.8 s to cover 1 km. How fast was the car going when it first began to accelerate? Answer in units of m/s. I tried converting 30.8 km/sec to m/s then subtracting 0.0442, ...

*Sunday, June 28, 2015 by Naomi*

**Physics**

If the time (up and down) the ball remains in the air is 2.14 s, find its speed when it caught. The acceleration of gravity is 9.8 m/s^2 . Neglect air resistance. Answer in units of m/s If the time the ball remains in the air is 2.27 s, find the maximum height hmax the ball ...

*Sunday, June 28, 2015 by Naomi*

**physics**

I really need help with these questions. My teacher doesn't provide me with anything to go on only some formulas and maybe 3 examples. It would be greatly appreciated! 1. Find the speed of a rock which is thrown off the top of a 20 m tall building at 15 m/s when it makes ...

*Sunday, June 28, 2015 by #%$*

**physics**

Am i doing this right? A cannon is shot at a 30 degree angle above the horizontal with a velocity of 240 m/s. What is the range of this shot? Range = Vm^2 sin2(theta) / (g) (240m/s^2)sin(2(30)) / (10ms^2) = 4988 meters?

*Sunday, June 28, 2015 by #%$*

**Physics**

Calculate the initial velocity for each using the average time of fligh up, the acceleration of gravity and the initial velocity. The average time up for A is 3.18s and for B is 1.87s and using the formula t=Vo Sin(theta)/g. Please and thank you!!!

*Sunday, June 28, 2015 by Mark*

**physics, Bauchi State University **

10kg block rest on top of a 40kg slap which rest on a frictionless flow. the coefficient of static and friction between the block and the slap are 9.60 and 0.40 respectively. the block is pulled with a force of 100 Newton. what are the acceleration of (a) the block (b) the slap

*Sunday, June 28, 2015 by yacxeen*

**St. Basil's school. Physics **

The time period of two pendulums are 1.44s and 0.36s respectively. Calculate the ratio of their lengths.

*Sunday, June 28, 2015 by Richa *

**Physics**

Calculate the initial velocity for each using the average time of fligh up, the acceleration of gravity and the initial velocity. The average time up for A is 3.18s and for B is 1.87s and using the formula t=Vo Sin(theta)/g. Please and thank you!!!

*Sunday, June 28, 2015 by Mark*

**physics mechanics **

10kg block rest on top of a 40kg slap which rest on a frictionless flow. the coefficient of static and friction between the block and the slap are 9.60 and 0.40 respectively. the block is pulled with a force of 100 Newton. what are the acceleration of (a) the block (b) the slap

*Sunday, June 28, 2015 by yakubu iliya *

**Physics**

an automobile travels 3 miles due north then 5 miles north of east. what is your resultant displacement?

*Sunday, June 28, 2015 by Ava*

**physics**

show that the weight of an object on moon is one-sixth of its weight on the earth given mass of earth=5.98*10power24kg, radius of earth=6.37*10power6m. given mass of moon=7.36*10power22kg, radius of moon=1.74*10power6m.

*Sunday, June 28, 2015 by fatin*

**physics**

A spring with a spring constant of 10 N/m is stretched 0.25 meters and released. How much force is needed to accomplish this? What is the period?

*Saturday, June 27, 2015 by yep*

**physics**

Car A is travelling at 22.0 m/s and car B at 29.0 m/s. Car A is 300 m behind Car B when the drive of car A accelerates his car with an acceleration of2.4 m/s2. How long does it take Car A to overtake Car B?

*Saturday, June 27, 2015 by shay*

**Physics**

what is the northward and eastward components of a 550 kph velocity of an airplane going NE?

*Saturday, June 27, 2015 by Kath*

**Physics**

what is the northwest and eastward components of a 550 kph velocity?

*Saturday, June 27, 2015 by Kath*

**physics**

A 300 kg boulder is dragged 8 m across level ground with a chain that makes an angle of 37° with the horizontal. If the applied force on the chain is 800 N and there is a coefficient of friction of 0.20, find (a) the work done by the applied force, (b) the force of ...

*Friday, June 26, 2015 by zuqndorpchfj*

**physics**

A 30 kg sled is pulled at constant speed with a horizontal rope for a distance of 450 m. The coefficient of friction is 0.15. Find the work done by the applied force on the rope. it looks like this means we have to find the applied force in newtons before we can solve this. ...

*Friday, June 26, 2015 by zuqndorpchfj*

**physics**

I keep on getting the second part wrong. Can you please tell me where I messed up? Thank you. The lead female character in the movie Diamonds Are Forever is standing at the edge of an offshore oil rig. As she fires the gun, she is driven back over the edge and into the sea. ...

*Friday, June 26, 2015 by Lola*

**physics**

please help with cart thing A 45 kg cart is pushed up a ramp a length of 5.8 m from rest, attaining a speed of 2.6 m/s at the top of the ramp, which is 1.7 m high. The coefficient of friction between the cart and the ramp is 0.13. a) Determine the work done against: 1) gravity...

*Friday, June 26, 2015 by idnchfywek*

**physics**

A 200 g model rocket is observed to rise 100 m above the ground after launch. What must have been the launch speed of the rocket at the ground?

*Thursday, June 25, 2015 by idnchfywek*

**Physics**

What is the relative humidity on a 25.0 °C day when the air contains 14 g/m3 of water vapor?

*Thursday, June 25, 2015 by Donnie*

**physics**

I have no idea. Please help. Thank you. The drawing shows a sulfur dioxide molecule. It consists of two oxygen atoms and a sulfur atom. A sulfur atom is twice as massive as an oxygen atom. Using this information and the data provided in the drawing, find (a) the x coordinate ...

*Thursday, June 25, 2015 by Lola*

**Physics**

A box is sliding down an incline tilted at an angle of 2.14° above horizontal. The box is sliding down the incline at a speed of 5.15 m/s. The coefficient of kinetic friction between the box and the incline is 0.387. How far does the box slide down the incline before ...

*Thursday, June 25, 2015 by Jen*

**Science physics**

a machine was used to lift a load of 30N through a distance of 2metres. the effort applied was 10N through a distance of 8metres. calculate the mechanical advantage

*Thursday, June 25, 2015 by Arnold*

**physics**

a screen is placed at a distance of 1.5 m from a narrow slit. the slit is illuminated by light of wavelength 6000 angstrom if the first minimum on either side of the central maximum is at a distance of 5 mm from , find the width of the slit

*Thursday, June 25, 2015 by Snehal Semwal*

**Physics**

Galileo’s law of falling bodies states that the rate of fall caused by gravity is the same for all objects, regardless of weight. This means that all objects have a free-falling acceleration of 9.8m/s2. However, a significant contradiction of this theory is the fact that ...

*Thursday, June 25, 2015 by Aurora*

**Physics**

Would a feather have more air resistance than a lump of lead?

*Thursday, June 25, 2015 by Emily*

**physics**

Ican Flye performs the infamous "Triple Lindy" dive from a point 15 m above water. a. If he starts his dive with no vertical velocity, how long will it take him to hit the water? b. How fast will he be traveling vertically when he hits the water? c. If he hits the ...

*Thursday, June 25, 2015 by Anonymous*

**Physics**

A 2.0 kg block of iron slides along a floor, decreasing its speed from 4.0 m/s to 1.0 m/s. a) How much work does the frictional resistance of the floor do on the block? b) If the reduction in velocity occurred over a distance of 10 m, what was the force of friction acting on ...

*Wednesday, June 24, 2015 by idnchfywek*

**physics**

7. An airplane has a gun that fires bullets straight ahead at the speed of 600 miles per hour when tested on the ground while the plane is stationary. The plane takes off and flies east at 600 miles per hour. Explain whether each of the following is possible for the pilot to ...

*Wednesday, June 24, 2015 by allexelle*

**physics**

If a freely falling rock were equipped with a speedometer, by how much would its speed readings increase with each second IF it were on a planet where g = 20 m/s2? Show all work leading to your answer.

*Wednesday, June 24, 2015 by allexelle*

**physics**

a ball is projected horizontally with speed u from a tower. 4 seconds after the throw it's velocity is at 45¡ã with horizontal. How long after projection, the velocity is at 37¡ã with horizontal?

*Wednesday, June 24, 2015 by SR*

**Physics - Equalibrium**

Three Fixed pulleys with a common center have the following radi of Ra=16cm, Rb=24cm and Rc=36cm with the applied forces <- Fc; /Fa (pointing southwest); and Fb (pointing southeast). Find the Resultant Torque given Fa=25N; Fb=75N; and Fc=120N.

*Wednesday, June 24, 2015 by Nathan*

**Physics**

A 45 kg cart is pushed up a ramp a length of 5.8 m from rest, attaining a speed of 2.6 m/s at the top of the ramp, which is 1.7 m high. The coefficient of friction between the cart and the ramp is 0.13. a) Determine the work done against: 1) gravity 2) inertia 3) friction. b) ...

*Wednesday, June 24, 2015 by jdemxkslwid*

**physics**

I have no way to solve this question. help me please The drawing shows a sulfur dioxide molecule. It consists of two oxygen atoms and a sulfur atom. A sulfur atom is twice as massive as an oxygen atom. Using this information and the data provided in the drawing, find (a) the x...

*Wednesday, June 24, 2015 by Lola*

**Physics **

A 50kg sign for a local business is hung from a bar which meets a wall at right angles as shown in figure 1. The bar is 1.5 meters long, and it's mass may be neglected. The center of mass of th sign is 1.0 meters from the wall (but .50 meters from the tip of the cable) as ...

*Wednesday, June 24, 2015 by David*

**Physics**

a 1.92 kg ball is connected by means of two massless strings, each of length L = 1.69 m, to a vertical, rotating rod. The strings are tied to the rod with separation d = 1.69 m and are taut. The tension in the upper string is 51.0 N. What are (a) the tension in the lower ...

*Wednesday, June 24, 2015 by Jeus*

**Physics**

For centripetal acceleration, if the radius increases, does that mean the angle is decreasing?

*Wednesday, June 24, 2015 by Emily*

**Physics**

The ride drops riders from the top of a tall tower and let's them free fall for a short time before bringing them to a stop. For the riders' safety, you must make sure the riders do not experience an acceleration greate than 2g. Assume the riders have a constant ...

*Wednesday, June 24, 2015 by Rolf*

**Physics**

if the distance and height of a track increase, does the car's accepted velocity and acceleration increase?

*Wednesday, June 24, 2015 by Tayla*

**Physics**

The speed of a projectile when it reaches its maximum height is 0.42 times its speed when it is at half its maximum height. What is the initial projection angle of the projectile?

*Wednesday, June 24, 2015 by Mark*

**physics**

You have a mass of 60 kg and run up some stairs that are 5 m high in 6 seconds. How much power did you produce?

*Wednesday, June 24, 2015 by abc123*

**Physics**

A object 0.25mm long is viewed through a converging lens.calculate the distance of the object from the lens,size of the image,power of the lens

*Tuesday, June 23, 2015 by Anonymous*

**physics**

You push against a steamer trunk at an angle of 33° with the horizontal . The trunk is on a flat floor and the coefficient of static friction between the trunk and floor is 0.55. The mass of the trunk is 43 kg. What is the minimum magnitude of force that will allow you to ...

*Tuesday, June 23, 2015 by alex*

**Physics**

Please help. To cool a hot bath containing 50L of water at 50 degrees Celsius down to 20degrees Celsius, what volume of cold water at 5 degrees Celsius would be needed? (in litres) and what mass of ice at 0 degrees celcius would be needed? i'm thinking about using q=...

*Tuesday, June 23, 2015 by Anonymous*

**physics**

A car with a mass of 1.2 × 103 kilograms starts from rest and attains a speed of 20 meters/second in 5 seconds. What net force acted on the car to cause that acceleration? 3.0 × 102 newtons 6.0 × 102 newtons 1.2 × 103 newtons 4.8 × 103 newtons 1.2...

*Monday, June 22, 2015 by sc*

**physics**

What amount of heat is required to raise the temperature of 20 grams of water from 10°C to 30°C? The specific heat of water is 4.18 J/g°C. 1200 joules 1500 joules 1700 joules 1900 joules 2000 joules

*Monday, June 22, 2015 by sc*

**physics**

what acceleration is imported to a football when the player kicked it with a force of 25 N mass of football 0.40kg

*Monday, June 22, 2015 by Anonymous*

**Physics**

A bottle with a volume of 196 U. S. fluid gallons is filled at the rate of 1.08 g/min. In years, how long does the filling take? (The density of water is 1 g/cm3 and 1 U.S. fluid gallon = 231 in3.) 196(231)/(1.08) The answer given was 1.31 years, not sure of the steps.

*Monday, June 22, 2015 by Ralph*

**physics**

A projectile of mass 1.000 kg is shot straight up with an initial speed of 23.0 m/s. (a) How high would it go if there were no air resistance? i got 26.99, which is correct (b) If the projectile rises to a maximum height of only 17.8 m, determine the magnitude of the average ...

*Sunday, June 21, 2015 by Lola*

**physics**

The drawing shows two boxes resting on frictionless ramps. One box is relatively light and sits on a steep ramp. The other box is heavier and rests on a ramp that is less steep. The boxes are released from rest at A and allowed to slide down the ramps. The two boxes have ...

*Sunday, June 21, 2015 by Lola*

**physics**

Two satellites, A and B, are in different circular orbits about the earth. The orbital speed of satellite A is thirty-four times that of satellite B. Find the ratio (TA/TB) of the periods of the satellites. Thank you!

*Sunday, June 21, 2015 by Lola*

**Physics **

A wheel has a radius of 3.1 m. How far (path length) does a point on the circumference travel if the wheel is rotated through the following angles, respectively? (a) 36° m (b) 36 rad m (c) 36 rev m

*Sunday, June 21, 2015 by Antonio*

**physics 1401**

If a vector A= -5.0x-4.0y and vector B = -3.0x+8.0y, then the magnitude of vector C= A-B is a. 13.4 b. 12.2 c. 148 d. 7.2 e. 4.5

*Sunday, June 21, 2015 by jcarrington*

**physics**

A 30-kg girl is bouncing on a trampoline. During a certain interval after she leaves the surface of the trampoline, her kinetic energy decreases to 205 J from 435 J. How high does she rise during this interval? Neglect air resistance.

*Sunday, June 21, 2015 by Lola*

**physics**

A 54.5-kg skateboarder starts out with a speed of 1.95 m/s. He does +80.0 J of work on himself by pushing with his feet against the ground. In addition, friction does -265 J of work on him. In both cases, the forces doing the work are nonconservative. The final speed of the ...

*Sunday, June 21, 2015 by Lola*

**physics**

A 50-kg box is being pushed a distance of 6.4 m across the floor by a force P with arrow whose magnitude is 154 N. The force P with arrow is parallel to the displacement of the box. The coefficient of kinetic friction is 0.24. Determine the work done on the box by each of the ...

*Sunday, June 21, 2015 by Lola*

**physics**

A baseball is thrown from the roof of a 24.0-m-tall building with an initial velocity of magnitude 10.0 m/s and directed at an angle of 53.1° above the horizontal.

*Sunday, June 21, 2015 by Anonymous*

**physics 1401**

A bullet is fired from a gun at 300 m/s. It hits the ground at 3s later. At what angle (in degrees) above the horizon was the bullet fired? (Assume no air resistance)

*Sunday, June 21, 2015 by jcarrington*