Tuesday

October 21, 2014

October 21, 2014

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**physics**

A car is traveling at 100 km/h, due northwest. The driver puts on the brakes and turns the corner. Four seconds later, he is heading east at 50 km/h. What is the average acceleration
*Thursday, October 2, 2014 at 9:24pm*

**physics**

Drow a velocity time graph graph for the ball starting 1.0 s before the collision to 1.0s after the collision
*Thursday, October 2, 2014 at 6:51pm*

**Physics**

The hare and the tortoise are at the starting line together. When the gun goes off, the hare moves off at a constant speed of 10 meters per second. (Ignore the acceleration required to get the animal to this speed.) The tortoise starts from a dead stop, but accelerates at a ...
*Thursday, October 2, 2014 at 6:34pm*

**Physics**

A train is moving parallel and adjacent to a highway with a constant speed of 22 m/s. Ini- tially a car is 35 m behind the train, traveling in the same direction as the train at 36 m/s and accelerating at 4 m/s2. What is the speed of the car just as it passes the train? Answer...
*Thursday, October 2, 2014 at 6:32pm*

**physics**

What would be the resultant vector with an angle of 30° with the +x axis and has a y component of 1.2 Newtons?
*Thursday, October 2, 2014 at 6:30pm*

**physics**

Forces of 8.85 N and 2.21 N act at right angles on a stack. What is the mass of the stack if it accelerates at a rate of 4.4 m/s^2?
*Thursday, October 2, 2014 at 6:28pm*

**Physics**

Forces of 9.5 N and 5.12 N act at right angles on a reddish-green block of mass 3.19 kg. How much acceleration occurs?
*Thursday, October 2, 2014 at 6:23pm*

**physics**

A soccer ball is kicked from the ground with an initial speed of 19.4 m/s at an upward angle of 49.8˚. A player 48.5 m away in the direction of the kick starts running to meet the ball at that instant. What must be his average speed if he is to meet the ball just before ...
*Thursday, October 2, 2014 at 6:20pm*

**Physics wavelength question, help please .**

The energy of an X-RAY quantum of wavelength 1.0 X 10^-10 m is. its answer is 1.99 X 10^ -15, but i dont know how to solve it , thanks help please
*Thursday, October 2, 2014 at 6:08pm*

**Physics**

Having trouble on the question below. Would you do need to convert the km to meters and then multiply (4700*9.8*165500)? The first woman in space, cosmonaut Valentina Tereshkova, flew in 1963. She orbited the earth 48 times during her 70 hour 50 minute flight at an average ...
*Thursday, October 2, 2014 at 5:57pm*

**Physics **

A= 2i + 3j - k, B= 4i + 2j - 2k, Find a vector x parallel to A but has magnitude of B ? Answer is √12/7 (2i+3j) - K solve it , i have mcat admission test please solve it
*Thursday, October 2, 2014 at 5:42pm*

**physics**

An object is being thrown upward at 50m How long does it take the object to reach maximum height? What is the maximum height of the object? How much time does it take for the audit to return to its original position? What is the velocity of the object when it hits the ground? ...
*Thursday, October 2, 2014 at 5:06pm*

**physics**

A net force of 5.34 N acting for 4.23 s on a mass initial at rest, causes it to travel 4.75 m in a straight line. What is the mass?
*Thursday, October 2, 2014 at 4:26pm*

**Physics II**

A positively charged particle is moving with a velocity v in a large homogeneous magnetic field. (a) If the field is 4 mT, the mass of the particle is 33·10−9 kg, its initial speed 8.1 m/s, and its charge 6 μC, what is the magnitude of its acceleration? (in m...
*Thursday, October 2, 2014 at 4:01pm*

**Physics II**

The force on the rectangular loop of wire in the magnetic field in the figure below can be used to measure field strength. The field is uniform, and the plane of the loop is perpendicular to the field. Justify the claim that the forces on the sides of the loop are equal and ...
*Thursday, October 2, 2014 at 3:59pm*

**physics**

(a) What is the direction of the force on a wire carrying a current due east in a location where the Earth’s field is due north? Both are parallel to the ground. Answer: Direction of force is Vertically up from ground (b) Calculate the force per meter if the wire carries ...
*Thursday, October 2, 2014 at 3:51pm*

**Physics Constant Force question help.**

A constant force acting on body mass 5 kg changes its speed from 2 m/s to 7 m/s , the direction of motion remains unchanged, find FORCE. answer is 2.5, but help me solve it, thanks
*Thursday, October 2, 2014 at 3:51pm*

**Physics**

A wire carrying a 20.0–A current passes between the poles of a strong magnet that is perpendicular to its field and experiences a 2.47–N force on the 3.10 cm of wire in the field. What is the average field strength?
*Thursday, October 2, 2014 at 3:50pm*

**physics**

I am struggling with this. A wombat of mass 22.0 kg starting at rest slides 13.0 m down a tree at a speed of 5.80 m/s just before reaching the bottom. (a) What is the change in the gravitational potential energy of the wombat during the trip? (b) What is the wombat’s ...
*Thursday, October 2, 2014 at 3:46pm*

**physics**

I am having great difficulty with this question. A block is placed on a frictionless ramp at a height of 12.5 m above the ground. Starting from rest, the block slides down the ramp. At the bottom of the ramp, the block slides onto a frictionless horizontal track without ...
*Thursday, October 2, 2014 at 3:27pm*

**Physics **

An electric rod of 2000 watts rating boils a certain quantity if water in 10 minutes, the heat is generated for boiling this water is? answer is 12 X 10^5 Joules, but I cant solve it please solve it
*Thursday, October 2, 2014 at 3:12pm*

**Physics**

To give a 20-kg child a ride, two teenagers pull on a 3.6-kg sled with ropes, as indicated in the figure. Both teenagers pull with a force of 55 N at an angle of 35 ∘ relative to the forward direction, which is the direction of motion. In addition, the snow exerts a ...
*Thursday, October 2, 2014 at 3:03pm*

**physics**

Three point charges are held at the corners of an equilateral triangle,if q=2 micro columb and length =3cm what is the resultant force on the +q charge
*Thursday, October 2, 2014 at 2:30pm*

**physics intro**

A truck with a mass of 14,0 00 kg is pushed with a force of 9200 N. If the frictional force is 2150 N what is the truck’s acceleration?
*Thursday, October 2, 2014 at 2:03pm*

**Physics 1**

A disk rotates with constant angular acceleration. The initial angular speed of the disk is 2π rad/s. After the disk rotates through 17π radians, the angular speed is 18π rad/s. (a) What is the magnitude of the angular acceleration? answer in rad/s2 (b) How much...
*Thursday, October 2, 2014 at 1:41pm*

**physics**

A box has a mass of 0.345 kg. It is on a very smooth (frictionless) horizontal surface and is acted upon by a force of 3.76 N at an angle of θ = 57.1° with the horizontal. The magnitude of the acceleration of the box is m/s2?
*Thursday, October 2, 2014 at 1:32pm*

**physics**

A snowmobile is pulling a large sled across a snow-covered field. The weight of the sled is 3560 N. If the coefficient of friction of the sled is 0.12, what is the pulling force supplied by the snowmobile?
*Thursday, October 2, 2014 at 1:02pm*

**Physics**

A motor of a certain elevator gives it a constant upward acceleration of 0.767 m/s2, the elevator starts from rest, accelerates for 2s, then continues with a constant speed. a) What is his final speed after 2s? b) Calculate speed after 1 ,and 3 s.? c) How far has it risen 1,2,...
*Thursday, October 2, 2014 at 12:44pm*

**physics**

Explain why the line touches the x-axis at approximately 30oC and 45oC.
*Thursday, October 2, 2014 at 11:30am*

**Physics**

A 2.87 kg object initially moving in the positive x-direction with a velocity of +4.87 m/s collides with and sticks to a 1.96 kg object initially moving in the negative y-direction with a velocity of -2.55 m/s. Find the final components of velocity of the composite object. (...
*Thursday, October 2, 2014 at 10:50am*

**physics**

even if drag force i.e air resistance is greater in magnitude as compared to other force ,there will be no motion in the direction of drag force, right?motion will be still in direction of that 'other force 'but as it is less than drag force there will be deceleration...
*Thursday, October 2, 2014 at 10:21am*

**physics**

direction of drag force i.e air resistance .is it always upward?or like friction force it just concern with opposing motion can be in any direction? in a motion it can be in any direction opposite to direction of motion?
*Thursday, October 2, 2014 at 10:10am*

**physics**

A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. The total mass of the wagon, rider, and rock is 90 kg. The mass of the rock is 0.26 kg. Initially the wagon is rolling forward at a speed of 0.53 m/s. Then ...
*Thursday, October 2, 2014 at 2:58am*

**physics**

Object A is moving due east, while object B is moving due north. They collide and stick together in a completely inelastic collision. Momentum is conserved. Object A has a mass of mA = 16.7 kg and an initial velocity of nu Overscript bar EndScripts Subscript 0A = 8.32 m/s, due...
*Thursday, October 2, 2014 at 2:58am*

**physics**

Batman (mass = 89.1 kg) jumps straight down from a bridge into a boat (mass = 452 kg) in which a criminal is fleeing. The velocity of the boat is initially +12.9 m/s. What is the velocity of the boat after Batman lands in it?
*Thursday, October 2, 2014 at 2:57am*

**physics**

A lumberjack (mass = 95.7 kg) is standing at rest on one end of a floating log (mass = 218 kg) that is also at rest. The lumberjack runs to the other end of the log, attaining a velocity of +2.54 m/s relative to the shore, and then hops onto an identical floating log that is ...
*Thursday, October 2, 2014 at 2:57am*

**physics**

A car accelerates uniformly from rest to 18.4 m/s in 4.36 s along a level stretch of road. Ignoring friction, determine the average power required to accelerate the car if (a) the weight of the car is 6.11 x 103 N, and (b) the weight of the car is 1.01 x 104 N.
*Thursday, October 2, 2014 at 2:56am*

**physics**

The (non-conservative) force propelling a 1.90 x 103-kg car up a mountain road does 6.70 x 106 J of work on the car. The car starts from rest at sea level and has a speed of 20.0 m/s at an altitude of 1.80 x 102 m above sea level. Obtain the work done on the car by the ...
*Thursday, October 2, 2014 at 2:56am*

**physics**

A pendulum consists of a small object hanging from the ceiling at the end of a string of negligible mass. The string has a length of 0.73 m. With the string hanging vertically, the object is given an initial velocity of 2.0 m/s parallel to the ground and swings upward in a ...
*Thursday, October 2, 2014 at 2:55am*

**physics**

A 17-kg sled is being pulled along the horizontal snow-covered ground by a horizontal force of 20 N. Starting from rest, the sled attains a speed of 2.2 m/s in 8.4 m. Find the coefficient of kinetic friction between the runners of the sled and the snow.
*Thursday, October 2, 2014 at 2:54am*

**physics**

A water-skier is being pulled by a tow rope attached to a boat. As the driver pushes the throttle forward, the skier accelerates. A 65.6-kg water-skier has an initial speed of 5.2 m/s. Later, the speed increases to 11.9 m/s. Determine the work done by the net external force ...
*Thursday, October 2, 2014 at 2:53am*

**physics**

A golf club strikes a 0.040-kg golf ball in order to launch it from the tee. For simplicity, assume that the average net force applied to the ball acts parallel to the ball’s motion, has a magnitude of 7950 N, and is in contact with the ball for a distance of 0.011 m. ...
*Thursday, October 2, 2014 at 2:52am*

**Physics**

A 0.60-kg basketball is dropped out of the window that is 6.1 m above the ground. The ball is caught by a person whose hands are 1.2 m above the ground. (a) How much work is done on the ball by its weight? (b) What is the gravitational potential energy of the basketball, ...
*Thursday, October 2, 2014 at 12:34am*

**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 ...
*Thursday, October 2, 2014 at 12:33am*

**Physics**

(II) Every few hundred years most of the planets line up on the same side of the Sun. Calculate the total force on the Earth due to Venus, Jupiter, and Saturn, assuming all four planets are in a line, Fig. 5–44. The masses are mV = 0.815 mE, mj = 318 mE, mSat = 95.1 mE, ...
*Thursday, October 2, 2014 at 12:24am*

**Physics**

A horizontal force of 150 N is used to push a 42.0-kg packing crate a distance of 6.60 m on a rough horizontal surface. If the crate moves at constant speed, find each of the following.
*Wednesday, October 1, 2014 at 11:51pm*

**Physics Help Please!!!! Graphs Please Please!!!**

------A part is on an assembly line going between one station and another. if the part has a constant velocity ( and constant acceleration) , complete a sketch of the following two corresponding graphs. do not worry about numbers, but only the shape of the graphs. 1) Graph of ...
*Wednesday, October 1, 2014 at 10:27pm*

**physics**

I had asked a question.why when solid body with greater density than water is when dropped from floating boat water level rises? the answer has been given that as the solid body is more dense than water displaces less fluid as compared to when it was a part of floating boat.i ...
*Wednesday, October 1, 2014 at 10:04pm*

**Physics Help Please!!!!**

1) A high-speed maglev train is traveling with a changing velocity. what can be said about the forces acting on the train? 2) An automated vehicle in a warehouse is traveling at a constant velocity. what can be said about the forces acting on the vehicle?
*Wednesday, October 1, 2014 at 10:03pm*

**Physics**

In an electricity experiment, a 1.30g plastic ball is suspended on a 56.0cm long string and given an electric charge. A charged rod brought near the ball exerts a horizontal electrical force F⃗ elec on it, causing the ball to swing out to a 25.0∘ angle and remain ...
*Wednesday, October 1, 2014 at 9:59pm*

**physics**

When a hammer strikes a nail, it is compressed along its length. Suppose that a steel nail 10.00 cm long and 3.00 mm in diameter is compressed an average of 65.0 µm by a 0.460 kg hammer during a 1.20 ms collision. (a) What average force was exerted on the nail by the ...
*Wednesday, October 1, 2014 at 9:51pm*

**physics**

A 0.450 kg hammer is moving horizontally at 6.00 m/s when it strikes a nail and comes to rest after driving it 1.00 cm into a board. (a) Calculate the duration of the impact. (b) What was the average force exerted on the nail?
*Wednesday, October 1, 2014 at 9:28pm*

**physics**

One hazard of space travel is debris left by previous missions. There are several thousand masses large enough to detect by radar orbiting the earth, but there are far greater numbers of very small masses such as flakes of paint. Calculate the force exerted by a 0.150 mg chip ...
*Wednesday, October 1, 2014 at 9:26pm*

**Physics**

Compressed air is used to fire a 50g ball vertically upward from a 0.60-m-tall tube. The air exerts an upward force of 3.0N on the ball as long as it is in the tube. How high does the ball go above the top of the tube?
*Wednesday, October 1, 2014 at 9:20pm*

**Physics**

I don't know if my answers are right. D: 1)Why is a time interval always positive? I'm not really sure but I wrote down something with vectors and scalars. 2)If the average acceleration of a car is zero in a given time interval, what can you tell about the displacement...
*Wednesday, October 1, 2014 at 9:15pm*

**College Physics**

A box with a mass of 3.5 kg is resting on a horizontal frictionless incline plane which is inclined at 28 degrees. Another force is applied at an angle of 13 degrees above the direction parallel to the incline. What does the magnitude of this force need to be, in Newtons, such...
*Wednesday, October 1, 2014 at 9:05pm*

**Physics**

Little Timmy falls down a well and hits the water 1.5s later. Determine the distance from the top of the well to the water below. Just an equation would be fine. Thanks in advance.
*Wednesday, October 1, 2014 at 9:02pm*

**calc / physics**

Suppose that a 5-foot-long chandelier falls from a 35-foot ceiling and that you are 6 feet tall and standing directly under the chandelier (a) How long do you have to get out of the way when it drops? =-16(t^2)+Vt+h =-16(t^2)+0+(35-5-6) (for the bottom of the chandelier and ...
*Wednesday, October 1, 2014 at 9:01pm*

**physics**

A bicyclist accelerates –0.87 m/s2 during a 3.8 s interval. What is the change in the velocity of the bicyclist and bicycle?
*Wednesday, October 1, 2014 at 8:20pm*

**physics**

An automobile with an initial speed of 3.25 m/s accelerates uniformly at the rate of 3.2 m/s2. Find the final speed of the car after 4.4 s. Answer in units of m/s
*Wednesday, October 1, 2014 at 7:26pm*

**physics**

How can I find the mass of a weight in pounds? The question asks to find the mass of Fw=5.5*106 lb (10 to the 6th) Do I divide by 9.8? and or convert to Newtons?
*Wednesday, October 1, 2014 at 5:29pm*

**Physics**

(a) A truck of mass 1870 kg travelling at 80 km/h braked to 55 km/h then continued at that speed. How much work was done by the brakes during that period? I just wanted to check my answer... 243334 J ??
*Wednesday, October 1, 2014 at 5:08pm*

**physics**

A packaging freight 1.45 m by 21.0 cm by 29.0 cm has a mass of 155 kilograms find the stress (in k p a) exerted by the crate on the floor in each of the 3 possible positions my problem is I don't know how to convert this equation into kPa
*Wednesday, October 1, 2014 at 3:22pm*

**physics question solved**

What is the rate of deceleration of a 1400-kg SUV that is going 75.0 km/h and then slows to 25.0 km/h in 8.20 s? Figured it out, Don't worry about the mass, just solve for Deceleration. which is deltavelocity/delta time >>Subtract First(75 - 25) = 50 km/hr*(1hr/3600 ...
*Wednesday, October 1, 2014 at 2:37pm*

**physics**

A river flows toward 90 degrees. A river boat pilot heads the boat at 297 degrees and is able to go straight across the river at 6 m/s. What is the velocity of the current? What is the velocity of the boat?
*Wednesday, October 1, 2014 at 12:20pm*

**physics**

A stone is thrown upward a 20 m/s. It is caught on its way down 5.0 m above where it was thrown. How fast was it going when it was caught?
*Wednesday, October 1, 2014 at 12:04pm*

**Physics**

A boy walk's 1kg duewest and den 1kg duenorth find it resultance displacement and it direction to d horizontal
*Wednesday, October 1, 2014 at 10:08am*

**Physics**

What is the rate of deceleration of a 1400-kg SUV that is going 75.0 km/h and then slows to 25.0 km/h in 8.20 s?
*Wednesday, October 1, 2014 at 7:55am*

**physics**

When a solid is dropped from the boat (floating in water)into the water ,then the level of water will fall if density of that solid body is greater than density of water i.e when that solid body sinks.WHY?I tried hard ,but i am unable to figured it out according to my ...
*Wednesday, October 1, 2014 at 4:19am*

**Physics**

A 5.00×10^5-kg rocket is accelerating straight up. Its engines produce 1.250×10^7 N of thrust, and air resistance is 4.50×10^6 N. What is the rocket’s acceleration? I just need the formula for finding the acceleration.
*Wednesday, October 1, 2014 at 3:20am*

**physics**

(a) A truck of mass 1870 kg travelling at 80 km/h braked to 55 km/h then continued at that speed. How much work was done by the brakes during that period? I just wanted to check my answer... 243334 J ??
*Wednesday, October 1, 2014 at 3:12am*

**Physics**

A Volkswagen runs straight off a cliff. The Volkswagen is traveling at a speed of 39.0 m/s when it leaves the road. If the cliff is 16.0 m high, how far horizontally does the car travel before it smashes into the ground below?
*Wednesday, October 1, 2014 at 2:27am*

**physics**

how far will you travel if you maintain a speed of 100m/s for 30s?
*Wednesday, October 1, 2014 at 2:21am*

**Physics**

A person reaches a maximum height of 65cm when jumping straight up from a crouched position. During the jump itself, the person's body from the knees up rises a distance of around 50cm . To keep the calculations simple and yet get a reasonable result, assume that the ...
*Wednesday, October 1, 2014 at 12:58am*

**physics **

A 220-kg log is pulled up a ramp by means of a rope that is parallel to the surface of the ramp. The ramp is inclined at 26.6° with respect to the horizontal. The coefficient of kinetic friction between the log and the ramp is 0.863, and the log has an acceleration of 0....
*Wednesday, October 1, 2014 at 12:20am*

**physics**

A rocket blasts off from rest and attains a speed of 59.4 m/s in 14.1 s. An astronaut has a mass of 66.7 kg. What is the astronaut's apparent weight during takeoff?
*Tuesday, September 30, 2014 at 11:55pm*

**Physics**

Q. Defined escape velocity obtain an expression for the escape velocity of a body from the surface of the earth?
*Tuesday, September 30, 2014 at 11:30pm*

**physics**

A body travels with uniform acceleration.Its final velocity,v=180-7x,where x is the displacement.Then find its acceleration.
*Tuesday, September 30, 2014 at 11:04pm*

**physics**

You are in a hot-air balloon that, relative to the ground, has a velocity of 5.40 m/s in a direction due east. You see a hawk moving directly away from the balloon in a direction due north. The speed of the hawk relative to you is 1.05 m/s. What are (a) the magnitude and (b)...
*Tuesday, September 30, 2014 at 11:01pm*

**Physics **

A ball is thrown vertically upward with an initial speed of 11 m/s . Then, 0.67 s later, a stone is thrown straight up (from the same initial height as the ball) with an initial speed of 25 m/s . How far above the release point will the ball and stone pass each other? The ...
*Tuesday, September 30, 2014 at 9:50pm*

**Physics**

Human feet and legs store elastic energy when walking or running. They are not nearly as efficient at doing so as kangaroo legs, but the effect is significant nonetheless. If not for the storage of elastic energy, a 70.0-kg man running at 4.00 m/s would lose about 100 J of ...
*Tuesday, September 30, 2014 at 9:39pm*

**Physics **

A velodrome is built for use in the Olympics (see the figure below). The radius of curvature of the surface is 15.9 m. At what angel should the surface be banked for cyclists moving at 15.0 m/s? Choose an angle so that no frictional force is needed to keep the cyclists in ...
*Tuesday, September 30, 2014 at 9:35pm*

**physics**

A cannon is fired horizontally from a platform . The platform rests on a flat, icy, frictionless surface. Just after the shell is fired and while it is moving through the barrel of the gun, the shell (mass 3.2 kg) has an acceleration of 12500 m/s2. At the same time, the cannon...
*Tuesday, September 30, 2014 at 9:28pm*

**Physics **

Kangaroos can easily jump as far as 8.0 m. If a kangaroo makes five such jumps westward and then seven such jumps northward, what angle would the resultant displacement vector make with the northern displacement vector? What is the magnitude of the total displacement?
*Tuesday, September 30, 2014 at 9:24pm*

**Physics College**

What is the rate of deceleration of a 1400-kg SUV that is going 75.0 km/h and then slows to 25.0 km/h in 8.20 s?
*Tuesday, September 30, 2014 at 9:22pm*

**physics**

a Baseball player throws a ball for the outfield horizontally such that it is released 1.5 meters above the ground. if the ball is to reach second base 20.0 meters away, how fast must the ball be thrown so that is does not bounce before reaching the base
*Tuesday, September 30, 2014 at 9:20pm*

**Physics (Force)**

A power wheelbarrow has a mass of 432 kg. What force must be applied to give it an acceleration of 1.75 m/s2?
*Tuesday, September 30, 2014 at 9:12pm*

**Physics**

A Boeing 747 can travel up to 254m/s. The pilot must travel from Vancouver to Calgary, which is located 3.0 x 10^2 km [N] and 7.0 x 10^2 km [E]. There is a strong wind blowing at 50.0 m/s [SE] A) determine the direction that the plane must travel to reach its destination in ...
*Tuesday, September 30, 2014 at 9:11pm*

**Physics**

I need help setting up this problem. A tennis player serves a tennis ball such that it is moving horizontally when it leaves the racquet. When the ball travels a horizontal distance of 19 m, it has dropped 58 cm from its original height when it left the racquet. What was the ...
*Tuesday, September 30, 2014 at 9:04pm*

**Physics**

I need help setting up this problem. While standing on the roof of a building, a child tosses a tennis ball with an initial speed of 15 m/s at an angle of 20° below the horizontal. The ball lands on the ground 2.8 s later. How tall is the building? Thank you.
*Tuesday, September 30, 2014 at 9:03pm*

**Physics**

Add the two component vectors from Sample Problem 1 algebraically to erify that they equal the given vector The two component vectors are: 8.6m(North) and 12m (west) The given vector is 15m(West 35 degrees North) Because when i add 8.6 and 12 it doesnt equal 15m. It should ...
*Tuesday, September 30, 2014 at 8:52pm*

**physics PLEASE HELP**

Add the two component vectors from Sample Problem 1 algebraically to erify that they equal the given vector The two component vectors are: 8.6m(North) and 12m (west) The given vector is 15m(West 35 degrees North)
*Tuesday, September 30, 2014 at 8:40pm*

**Physics**

In an experiment done by scattering 5.5 MeV α particles on a thin gold foil, students find that 10,000 α particles are scattered at an angle greater than 90 degrees. How many α particles will be scattered between 60 degrees and 80 degrees?
*Tuesday, September 30, 2014 at 8:29pm*

**physics**

calculate at what height above the earths surface a satellite must be placed if it is to remain over the same geographical point on the equator of the earth. what is the velocity of the satellite?
*Tuesday, September 30, 2014 at 8:22pm*

**physics**

In the Bohr model of the hydrogen atom, an electon mass= 9.11 x 10^-31 kg orbits a proton at a radius of 5.29 x 10^-11 m. The proton pulls on the electron with a force of 8.20 x 10^-8N. what is the speed of the electron? what is the period of the electron? I really need help ...
*Tuesday, September 30, 2014 at 8:20pm*

**Physics-Intro**

Find the total force necessary to give a rocket of mass 25,000 slugs an acceleration of 28.0 ft/s2.
*Tuesday, September 30, 2014 at 8:11pm*

**Physics help please**

In an experiment done by scattering 5.5 MeV α particleson a thin gold foil, students find that 10,000 α particles arescattered at an angle greater than 90 degrees. How many α particles will be scattered between 60 degreesand 80 degrees?
*Tuesday, September 30, 2014 at 8:00pm*

**physics**

An electron travels 2.7 m in 6.37 × 10−8 s. How fast is it traveling?
*Tuesday, September 30, 2014 at 7:50pm*

**Physics help please**

Rutherford Scattering Calculate the impact parameter for scattering a 7.7 MeV alpha particle from gold at an angle of (a) 1 degree and (b) 90 degrees?
*Tuesday, September 30, 2014 at 7:43pm*

**Physics help**

Add the two component vectors from Sample Problem 1 algebraically to erify that they equal the given vector The two component vectors are: 8.6m(North) and 12m (west) The given vector is 15m(West 35 degrees North)
*Tuesday, September 30, 2014 at 6:01pm*

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