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November 25, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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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

Physics Repost
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 5:26pm

Physics Repost
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 5:25pm

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 4:52pm

physics
A soccer ball is kicked at an angle of 30° to the horizontal with an initial velocity of 16 m/s. How far does the soccer ball go? A. 3.8 m B. 6.6 m C. 13.3 m D. 22.6 m i used the formula vf^2-(visin theta)^2 / 2g for this and solved it for 3.3m but none of the answers are...
Tuesday, September 30, 2014 at 4:16pm

Physics
a boat crosses a .2mi river is heading perpendicularly relative to the shore. its speed in still water is 4mph and the speed of the current is 6mph
Tuesday, September 30, 2014 at 4:05pm

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 3:28pm

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 3:27pm

Physics
HI I'm just looking for an answer for 3 questions as my textbook does not explain the answer. How a tin can loses heat through: 1) Conduction 2) Convection 3) Radiation
Tuesday, September 30, 2014 at 3:06pm

physics
Suppose a vector V⃗ makes an angle ϕ with respect to the y axis.What could be the x and y components of the vector V⃗ ? Express your answers in terms of the variables V and ϕ separated by a comma.
Tuesday, September 30, 2014 at 2:48pm

physics
A mass pulled by a constant force accelerates from 10 cm/s to 40 cm/s in 5.5 s. A second force accelerates the same mass from rest to 105 cm/s in 15.0 s. If the first force is known to be 5.0 N, that what is the magnitude of the second force?
Tuesday, September 30, 2014 at 1:41pm

physics
A block of mass m=8 kg is held at the rest on a smooth (fiction less) 37 degree incline by a horizontal force F. the magnitude of the force F (in N) is:
Tuesday, September 30, 2014 at 1:23pm

Physics
At a time when mining asteroids has become feasible, astronauts have connected a line between their 3360-kg space tug and a 6300-kg asteroid. Using their ship's engine, they pull on the asteroid with a force of 490 N. Initially the tug and the asteroid are at rest, 430 m ...
Tuesday, September 30, 2014 at 1:16pm

Physics
A car accelerates from rest at 5 m/s2 for 5 seconds. It moves with a constant velocity for some time, and then decelerates at 5 m/s2 to come to rest. The entire journey takes 25 seconds. On a separate sheet of paper, plot the velocity-time graph of the motion. Describe the ...
Tuesday, September 30, 2014 at 1:01pm

physics
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 11:43am

physics
One ball is dropped from a cliff. A second ball is thrown down 1.00 s later with an initial speed of 40.0 ft/s. How long after the second ball is thrown will the second ball overtake the first?
Tuesday, September 30, 2014 at 10:50am

physics
A woman raises a 65N box 16m in 4 seconds.Calculate the work done by the woman on the box
Tuesday, September 30, 2014 at 7:38am

physics
This graph in the figure (Figure 1) shows how the temperature of an initially solid sample changes as time goes by when it is placed above a flame that delivers a constant heating power (that is, a fixed amount of energy input in the form of heat each second). The process ...
Tuesday, September 30, 2014 at 3:34am

physics
A 20kg box rests ona table and a 10kg is placed on top of the 20kg box. Determine the normal force that the table exerts on the 20kg box and the normal force that the 20kg box exerts on the 10kg box. please help
Tuesday, September 30, 2014 at 3:03am

Physics
Which of the following are the correct units for mass?
Tuesday, September 30, 2014 at 1:07am

Physics
You want to use a rope to pull a 12-kg box of books up a plane inclined 30∘ above the horizontal. The coefficient of kinetic friction is 0.29. The rope pulls parallel to the incline. What force do you need to exert on the rope if you want to pull the box with a constant ...
Tuesday, September 30, 2014 at 12:38am

physics
The helicopter in the drawing is moving horizontally to the right at a constant velocity. The weight of the helicopter is W=41600 N. The lift force L generated by the rotating blade makes an angle of 21.0° with respect to the vertical. (a) What is the magnitude of the lift...
Tuesday, September 30, 2014 at 12:28am

Physics
A certain automobile engine delivers 2.24 ✕ 10^4 W (30.0 hp) to its wheels when moving at a constant speed of 31.0 m/s ( 69 mi/h). What is the resistive force acting on the automobile at that speed?
Monday, September 29, 2014 at 11:12pm

Physics
A washing machine drum has a diameter of 46 cm and spins at 400 revolutions per minute. Find the centripetal acceleration at the drum's surface. Give your answer in m/s
Monday, September 29, 2014 at 10:37pm

physics 12
a boeing 747 can travel up to 254m/s. The pilot must travel from vancouver to calgary, which is located 3.0x10^2km [N] and 7.0x10^2km [E]. there is strong wind blowing at 50.0m/s [SE].
Monday, September 29, 2014 at 10:24pm

Physics
Knowing that at the time of the release the balloon was 73.8 m above the ground, determine the time, τ, it takes the bag to reach the ground from the moment of its release.
Monday, September 29, 2014 at 9:32pm

physics
A 96.5 kg ice hockey player hits a 0.150 kg puck, giving the puck a velocity of 45.5 m/s. If both are initially at rest and if the ice is friction less, how far does the player recoil in the time it takes the puck to reach the goal 18.0 m away?
Monday, September 29, 2014 at 9:30pm

physics
A small coin, initially at rest, begins falling. If the clock starts when the coin begins to fall, what is the magnitude of the coin\'s displacement between t1 = 0.1749 s and t2 = 0.437 s?
Monday, September 29, 2014 at 9:21pm

physics
A man holding a rock sits on a sled that is sliding across a frozen lake (negligible friction) with a speed of 0.540 m/s. The total mass of the sled, man, and rock is 93.5 kg. The mass of the rock is 0.300 kg and the man can throw it with a speed of 15.0 m/s. Both speeds are ...
Monday, September 29, 2014 at 9:11pm

physics
Two ice skaters stand facing each other at rest on a frozen pond. They push off against one another and the 48-kg skater acquires a speed of 0.65 m/s. If the other skater acquires a speed of 0.84 m/s, what is her mass?
Monday, September 29, 2014 at 8:49pm

Physics
Nellie weighs 300 N and stands on a pair of bathroom scales. If she leans so that one-third of her weight is on the left scale, what is her reading on each scale?
Monday, September 29, 2014 at 8:21pm

physics
If you stand on a pair of bathroom scales, explain how the readings change as you shift your weight gradually from side to side. what rule governs the readings on the scale?
Monday, September 29, 2014 at 8:18pm

Physics
a) An electron in an atom has a speed of 2.2 × 10^6 m/s and orbits the nucleus at a distance of 5 × 10^-11m. What is its centripetal acceleration? (already solved) 9.68x 10^22 m/s^2 b) A neutron star of radius 17 km is found to rotate at 5 revolutions per second. ...
Monday, September 29, 2014 at 8:18pm

physics
A chunk of Martian rock falls off of a cliff and drops 47.7 m in 5.00 s. What is the acceleration due to gravity on the surface of Mars?
Monday, September 29, 2014 at 7:56pm

Physics
what is the mass density of mercury is 13.6g/cm^3. A cylinder of mercury has a diameter of 1 cm and a height of 76cm. what would the height of the cylinder of the water having a diameter of 1 cm and a mass equal to the mass of the mercury cylinder?
Monday, September 29, 2014 at 6:10pm

physics
A truck on a straight road starts from rest, accelerating at 2.00 m/s2 until it reaches a speed of 11.0 m/s. Then the truck travels for 65.0 s at constant speed until the brakes are applied, stopping the truck in a uniform manner in an additional 5.00 s. (a) How long is the ...
Monday, September 29, 2014 at 5:43pm

Physics please help
An ant travels 2.78 cm (West) and then turns and travels 6.25cm (south 40 degrees East). What is the ant's total displacement?
Monday, September 29, 2014 at 5:41pm

physics
In 10 seconds a car accelerates 3m/s^2 to 90m/s. How fast was the car going before it accelerated?
Monday, September 29, 2014 at 5:19pm

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