Physics

Physics
A steel section of the Alaskan pipeline had a length of 73.8 m and a temperature of 15.7 °C when it was installed. What is its change in length when the temperature drops to a frigid -45.3 °C?

physics
a pendelum with a mass of 2.5 kg is released from a height of 3.6 cm above the height of the lowest position. how fast will the pendelum be moving when it passes through the point of its swing?

physics
a 98 K crate is pushed to the top of a 2.5m ramp, which is inclined at 18 degrees with the horizontal. what is the potential energy of the crate?

Physics
A girl delivering newspapers travels 1 blocks west, 2 blocks north, then 4 blocks east. What is the magnitude of her resultant dis- placement? Answer in units of blocks. 002 (part 2 of 3) 10.0 points Find the direction (measured from due east, with counterclockwise positive) ...

physics
A 2.63 kg ball is dropped from the roof of a building 180.6 m high. While the ball is falling to Earth, a horizontal wind exerts a constant force of 13.0 N on the ball. How long does it take to hit the ground? The acceleration of gravity is 9.81 m/s2 . How far from the ...

Physics
A 555-g squirrel with a surface area of 945 cm2 falls from a 6.0-m tree to the ground. Estimate its terminal velocity. (Use the drag coefficient for a horizontal skydiver. Assume that the cross-sectional area of the squirrel can be approximated as a rectangle of width 11.6 cm ...

Physics
Taking the age of Earth to be about 4 ✕ 109 years and assuming its orbital radius of 1.5 ✕ 1011 m has not changed and is circular, calculate the approximate total distance Earth has traveled since its birth (in a frame of reference stationary with respect to the Sun).

Physics
At takeoff a commercial jet has a 45.0 m/s speed. Its tires have a diameter of 0.850 m. (a) At how many rpm are the tires rotating? Incorrect: Your answer is incorrect. rpm (b) What is the centripetal acceleration at the edge of the tire? 4764.70 Correct: Your answer is ...

Physics
Astrology, that unlikely and vague pseudoscience, makes much of the position of the planets at the moment of birth. The only known force a planet exerts on earth is gravitational. (a) Calculate the gravitational force exerted on a 4.00 kg baby by a 90 kg father 0.200 m away at...

physics
A rectangular box of length 2/3m is initially traveling at 2 m/s with its entire length over a smooth (perfectly frictionless)surface .The box gradually moves onto a rough surface and stops the instant that its entire length is positioned within the rough region. Determine the...

physics
a particle a of mass makes perfectly elastic collision with b which is at rest and fly apart in opp directions with same velocity then relation between their masses is

Physics
A 66000 kg iceberg at −6.7◦C breaks away from the polar ice shelf and floats away into the ocean at 6.36◦C. What is the final change in the entropy of the system, when the iceberg has completely melted? The specific heat of ice is 2010 J/kg ·◦C.

physics
Two stars X and Y travel counterclockwise in circular orbits about a galaxy. The radii of their orbits are in the ratio 4:1 . At some time, they are aligned making a straight line with the center of the galaxy. Five years later, star X has rotated through 90°, By what angle ...

physics
A 3.1 kg block initially at rest is pulled to the right along a horizontal frictionless surface by a constant horizontal force of 16.6 N. Find the speed after it has moved 3.8m.

Physics
The larger the frequency of the tuning fork, the smaller the length of the tube at which you hear the resonant sound. Explain why this is so (think in terms of the relationship between frequency and wavelength).

Physics
Suppose you used a 300 Hz tuning fork to produce resonant frequency in a tube whose diameter is 3.0 cm. At what length of the tube will you the resonant frequency if the air temperature inside the tube is 25 C. Assume that the tube is closed at one end.

Physics
Suppose that, during a thunderstorm, you heard a loud thunder 10 seconds after you saw the lightening. The air temperature on this day was 20 oC. How far away was the thunderstorm from where you were? Give your answer in kilometers and in miles.

Physics
A 0.50kg mass is suspended on a spring that stretches 3.0cm. a. What is the spring constant? b. What added mass would stretch the spring an additional 2.0cm? c. What is the change in potential energy when the mass is added? Conservation of energy is not my favorite......

Physics
A 100kg man stands initially on the left end of a 60 kg, flat-bottomed fishing boat that is 10 meters long. This end of the fishing boat is 60 meters from shore. No external forces act on the boat, such as air or water friction. If the man walks to the opposite end (right end...

physics
A helicopter flies 65km [N32°E] then 42km[E 21°] determine the total displacement of the helicopter.

Physics, please help
Copper has a breaking stress of about 3 × 10^8 N/m2. What is the maximum load that can be hung from a copper wire of diameter 0.5 mm? Answer in units of N. If 55% of this maximum load is hung from the copper wire, by what percentage of its length will it stretch? Answer in ...

Physics
A gas is kept at a pressure of 4.00 × 105 Pa and a temperature of 30.0 °C. When the pressure is reduced to 3.00 × 105 Pa and the temperature raised to 40.0 °C, the volume is measured to be 0.45 × 10^−4 m^3. Estimate the original volume of the gas. I tried using initial...

Physics
The density of copper is 8.96 g cm^−3 and its molar mass is 64 g mol^−1. The mass of an atom of copper is 1.1*10^-22 g Determine the number of copper atoms per cubic metre.

Physics
Copper has a breaking stress of about 3 × 10^8 N/m2. What is the maximum load that can be hung from a copper wire of diameter 0.5 mm? Answer in units of N. If 55% of this maximum load is hung from the copper wire, by what percentage of its length will it stretch? Answer in ...

physics
What is the average useful power output of a person who does 5.50×106 J of useful work in 6.50 h? Working at this rate, how long will it take this person to lift 1850 kg of bricks 1.20 m to a platform? (Work done to lift his body can be omitted because it is not considered ...

Physics
A shopper in a supermarket pushes a loaded cart with a horizontal force of 80.5N. If the cart has a mass of 33.8kg, how far will it move in 1.31s, starting from rest? The coefficient of friction is 0.12

Physics
A desk fan has three (approximately) rectangular sheets of 15.8 cm long and 5 cm wide, each with a mass of 140 g. The fan is rotating at a constant angular speed of 19.8 rad / s when the power is turned off. Due to friction the angular velocity of the fan slows down in a ...

Physics
A uniform disc of 2.98 kg is mounted so that it can rotate in the horizontal plane around a frictionless axis through its center of mass. The angular velocity of the disc at the start is 140 rpm. A hollow cylinder with thin walls and the same radius as the disc is released ...

Physics
A ball thrown up is caught by thrower 6 sec after start. The height to which the ball has risen is (g=10 m/s2)

Physics
A ball thrown up is caught by thrower 6 sec after start. The height to which the ball has risen is (g=10 m/s2)

AP Physics
What minimum speed does a 130 g puck need to make it to the top of a 3.8 m -long, 23 ∘ frictionless ramp?

Physics
Anthony Rizzo hits a baseball in such a way that it leaves his bat traveling at 40.4 m/s at an angle of 26 degrees above the horizontal. When hit, the baseball is 1.2 m above the ground, is in fair territory, and is 127 meters away from a 3.5 m tall fence? Is this a home run?

Physics!
An out-of-control truck with a mass of 5000kg is travelling at 35.0m/s (about 80mi/h) when it starts descending a steep (15 degrees), downward incline or slope. The incline is icy, so the coefficient of friction is 0.30. Use the work-energy theorem to determine how far the ...

PHysics
A gun is fired, and a 50gram bullet is accelerated to a muzzle speed of 100m/s. If the length of the gun barrel is 0.90m, what is the magnitude of the accelerating force? Assume the acceleration is constant. Help me please???

Physics
In moving a 35kg desk from one side of a room to another, a man finds that a horizontal force of 275N is necessary to set the desk in motion, and a force of 195N is necessary to keep it in motion at a constant speed. What are the coefficients of both static friction and ...

physics
circus juggler performs an act with balls that he tosses with his right hand and catches with his left had. Each ball is launched at an angle of 75° and reaches a maximum height 88 cm above the launching height. If it takes the juggler 0.2 s to catch a ball with his left hand...

Physics
In moving a 35kg desk from one side of a room to another, a man finds that a horizontal force of 275N is necessary to set the desk in motion, and a force of 195N is necessary to keep it in motion at a constant speed. What are the coefficients of both static friction and ...

physics
two aircraft P & Q are flying at the same speed, 300m/s.The direction along which P is flying is at right angle to the direction along which Q is flying. find the magnitude of the velocity of the aircraft P relative to aircraft Q?

physics
a drum holds 90 kg of water or 60 kg of gasoline. determine (a) the relative density of gasoline (b) the density of gasoline (c) the capacity of drum.

Physics HELP
A 2.0-m measuring stick of mass 0.215 kg is resting on a table. A mass of 0.500 kg is attached to the stick at a distance of 72.0 cm from the centre. Both the stick and the table surface are frictionless. The stick rotates with an angular speed of 6.50 rad/s. (a) If the stick ...

physics
If a spherical glass marble has a radius of 0.00661 m at 1.02×105 Pa, at what pressure will it have a radius of 0.00650 m?

Physics HELP
In a downtown office building you notice that each of the four sections of a rotating door has a mass of 90 kg. What is the width of each section of the door if a force of 58 N applied to the outer edge of a section produces an angular acceleration of 0.500 rad/s2?

physics
A “swing” ride at a carnival consists of chairs that are swung in a circle by 13.5 m long cables attached to a vertical rotating pole, as the drawing shows. Note that the cables make an angle of 60.0o with respect to the vertical, as shown. Suppose the total mass of a ...

Physics
A water pipe is inclined 31.0° below the horizontal. The radius of the pipe at the upper end is 2.00 cm. If the gauge pressure at a point at the upper end is 0.122 atm, what is the gauge pressure at a point 2.70 m downstream, where the pipe has narrowed to a 1.00 cm radius? ...

Physics
Water is ejected from a garden hose of radius 1.06 cm at a speed of 5.19 m/s. Find the flow rate through the hose.

Physics
Find the displacement in cubic meters of a boat weighing 4710 N.

Physics
A watertight car is submerged under water. What force is required to open a door of area 1.04 m2 if the average depth of water at the door is 1.56 m?

Physics
An air track cart with mass m 0.4kg and initial speed v0 = 0.7m/s collides with and sticks to a second cart that is at rest initially. If the mass of the second cart is m2 = 0.5kg, how much kinetic energy is lost as result of the collision?

physics
an object 5cm lenght is placed at distance of 20cm in front of a convex mirror of radius of curvature 30 cm . find the position of the image

Physics
A force of -7500 N is used to stop a 2000kg car traveling 25m/s. What breaking distance is needed to bring the car to a halt?

physics
a uniform beam 6.0m long and weighing 4kg rest on support at P & Q placed left and right 1.0m from each end of the beam. weight of mass 10kg and 8kg are placed near P & Q respectively on each end of the beam. calculate the reaction of P & Q.

physics
Score: 0 / 1 Tries left: 10 Question 5 A large crate has a mass of 214 kg. A horizontal force of positive 214 N is applied to it, causing it to accelerate at 0.130 m/s2 horizontally. What is the force of friction opposing the motion of the crate? Use the correct sign to ...

physics
Anna pushes horizontally on a 57 kg penguin with force of 19 N, but the penguin does not budge. Find the force of static friction between the penguin’s feet and the ground.

Physics
A flea can jump a vertical height h. What is the maximum horizontal distance it can jump? What is the time in the air in both cases?

Physics
A student pulls a box of books on a smooth horizontal floor, ignore friction with a force of 131 N in a direction of 37° above the horizontal. If the mass of the box and the books is 33.7 kg, what is the acceleration of the box?

Physics
A hula Hoop (I=1/2MR^2) rolls without sliding along the floor. The ratio of its translational kinetic energy to its rotational kinetic energy (about an axis through its center of mass) is: A. 1 B. 2 C. 3 D. 1/2

Physics
With her bare hands and her arms rigidly extended, a girl catches a 0.16kg baseball coming directly at her at speed of 25m/s. She shouts, “Ouch!’ because the ball stings her hands. She learns quickly how to move her hands with the ball as she catches it. If the contact ...

Physics
A tetherball apparatus consists of a ball attached to a 2.10 m rope that is attached in turn to the top of a 3.10 m tall pole. The ball is struck such that it moves horizontally around the pole. Immediately after the ball is struck, it moves at 5.57 m/s, and experiences a ...

physics
A car with a 65cm diameter wheel travels 3.0km. How many revolutions does the wheel make in this distance?

Physics
A physics student kicked a soccer ball toward an aprtment building 40.8 meters from her. The velocity of the ball was 40 m/s^2 @30 degrees. At what approximate height did the ball hit the building?

Physics
A 20.0-kg crate sits at rest at the bottom of a 20.0 m -long ramp that is inclined at 40 ∘ above the horizontal. A constant horizontal force of 290 N is applied to the crate to push it up the ramp. While the crate is moving, the ramp exerts a constant frictional force on it ...

Physics
A charged capacitor,C=10e-6 F, with an initial stored energy of 3.5J, is discharged across a resistor, R. The charge on the capacitor drops to 40% of its maximum value in time, t=8.2s, from the instant the switch is closed (t=0). Find the current through the resistor at a time...

physics
A car with a 65cm diameter wheel travels 3.0km. How many revolutions does the wheel make in this distance?

physics
A supertanker (mass = 1.57E+8 kg) is moving with a constant velocity. Its engines generate a forward thrust of 7.47E+5 N. Determine the magnitude of the resistive force exerted on the tanker by the water.

physics
A supertanker (mass = 1.57E+8 kg) is moving with a constant velocity. Its engines generate a forward thrust of 7.47E+5 N. Determine the magnitude of the resistive force exerted on the tanker by the water.

physics
When opening a door, you push on it perpendicularly with a force of 55.4 N at a distance of 0.728m from the hinges. What torque are you exerting relative to the hinges? (Does it matter if you push at the same height as the hinges?)

physics
Two children push on opposite sides of a door during play. Both push horizontally and perpendicular to the door. One child pushes with a force of 16.4 N at a distance of 0.590 m from the hinges, and the second child pushes at a distance of 0.470 m. What force must the second ...

physics
In the nail puller shown in the figure below you exert a force 53.2 cm from the pivot and the nail is 1.50 cm on the other side. What minimum force must you exert to apply a force of 1380 N to the nail to pull the nail up?

physics
How much work is done by the boy pulling his sister d = 25.0 m in a wagon as shown in figure below? Assume no friction acts on the wagon and he pulls with a force of 65.0 N and at an angle θ = 31.0°.

physics
Suppose a 300–g kookaburra (a large kingfisher bird) picks up a 77.0–g snake and raises it 2.70 m from the ground to a branch. How much work did the bird do on the snake? How much work did it do to raise its own center of mass to the branch?

physics
Calculate the force needed to bring a 1070–kg car to rest from a speed of 89.0 km/h in a distance of 110 m (a fairly typical distance for a non-panic stop). Suppose instead the car hits a concrete abutment at full speed and is brought to a stop in 2.34 m. Calculate the force...

physics
A 77.6 kg ice skater is skating along in a straight line (in the positive direction) at 10.3 m/s when he bends down and scoops up his 27.4 kg doggy sitting still on the ice. What will be the new velocity of the dog-n-skater?

physics
What is the average useful power output of a person who does 5.50×106 J of useful work in 6.50 h? Working at this rate, how long will it take this person to lift 1850 kg of bricks 1.20 m to a platform? (Work done to lift his body can be omitted because it is not considered ...

physics
when a tennis ball is served, it is a contact with the racket for a time that is typical 0.005 seconds. find the force needed to serve a 60.0 gram tennis ball moving with a velocity of 30.0m/s

physics
A car with a 65cm diameter wheel travels 3.0km. How many revolutions does the wheel make in this distance?

As physics
From the list of compounds below identify the molecules (find out the no. of molecules): 1) Propanone C3H6O Mr:58 2) Chromium Trioxide Cr2O3 Mr: 152 3) Rubidium Carbonate Rb2CO3 Mr: 231 4) Neon Ne Mr:20.2 5) Nitrophenol C6H5NO3 Mr: 139 6) Dinitrogentetraoxide N2O4 Mr:92 Please...

As physics
A cyclist moves along a horizontal road. She pushes on the pedals with a constant power of 250W. The mass of the cyclist and bicycle is 85kg. The total drag force is 0.4V^2, where v is the speed of the cyclist. i) Calculate the energy provided by the cyclist each minute when ...

Physics
Fig.19 shows a crane lifting a car of mass 850 kg at constant velocity through a height of 12m in a time of 40s. The crane has a working efficiency of 60%. i) Calculate the tension in the lifting cable (in N) ii) Calculate the total input power required by the crane to lift ...

Physics
A force is applied to a 22.5 kg object causing it to move at a constant velocity of 4.2 m/s with a coefficient of friction of 0.44. Suddenly, the applied force is removed, causing friction to be the only force acting on the object. How long will it take the object to come to ...

physics
Two workers are sliding 450 kg crate across the floor. One worker pushes forward on the crate with a force of 380 N while the other pulls in the same direction with a force of 380 N using a rope connected to the crate. Both forces are horizontal, and the crate slides with a ...

Physics
A 17 kg crate is placed on a horizontal conveyor belt. The materials are such that μs = 0.44 and μk = 0.21. A) What is the maximum acceleration the belt can have without the crate slipping? B) If acceleration of the belt exceeds the value determined in part A, what is the ...

Physics
A force is applied to a 22.5 kg object causing it to move at a constant velocity of 4.2 m/s with a coefficient of friction of 0.44. Suddenly, the applied force is removed, causing friction to be the only force acting on the object. How long will it take the object to come to ...

Physics
If you have an ideal spring with a mass m on it, and you measure a spring constant of 8 N/m, what do you expect to happen to the spring constant if you (be realistic): a. Take it to the moon b. Take it to the sun Would the constant remain the same for both a and b?

Physics
Olympic diver performs a dive from the 10 m platform and achieves a speed of 14 m/s just before entering the water. Neglecting air friction, approximately how many times larger the diver’s speed than the diver would have achieved by performing from a 1 m platform? How much ...

Physics
The wheels, axle, and handles of a wheelbarrow weigh W = 67 N. The load chamber and its contents weigh WL = 511 N. The drawing shows these two forces in two different wheelbarrow designs. To support the wheelbarrow in equilibrium, the man’s hands apply a force to the ...

physics
At 15 minutes past the hour, a 47.0 g mouse runs up a grandfather clock and sits himself down at the end of the minute-hand. If the minute-hand for the clock is 16.0 cm long, what is the magnitude of the torque exerted by the mouse on the minute-hand? Give your answer in the ...

Physics
The rolling resistance for steel on steel is quite low; the coefficient of rolling friction is typically μr=0.002. Suppose a 180,000 kg locomotive is rolling at 19 m/s on level rails. A) If the engineer disengages the engine, how much time will it take the locomotive to coast...

Physics
A 4500 kg truck is parked on a 7.0∘ slope. How big is the friction force on the truck?

Physics
A stubborn 110 kg pig sits down and refuses to move. To drag the pig to the barn, the exasperated farmer ties a rope around the pig and pulls with his maximum force of 800 N. The coefficients of friction between the pig and the ground are μs=0.80 and μk=0.50. Calculate the ...

Physics 1
A 1400 kg car traveling at a speed of 34 m/s skids to a halt on wet concrete where μk = 0.50. How long are the skid marks?

physics
A stone with a mass of 1.0 kg is tied to the end of a light string which keeps it moving in a circle with a constant speed of 4.0 m/s on a perfectly smooth horizontal tabletop. The radius of the path is 0.60 m. How much work does the tension in the string do on the stone as it...

physics
A 1000 kg car traveling is at 40.0 m/ s. To avoid hitting a second car the driver slams on his brakes. The brakes provide a constant friction force of 8000 N. ( a) Find the minimum distance that the brakes should be applied in order to avoid a collision with the vehicle in ...

Physics
The molecular bonds of diatomic molecules can be modeled as springs. The spring constant, k, for a HCl molecule is known to be 480 N/m. If the reduced mass of the molecule is 1.626×10-27 kg, what is the frequency at which the atoms in this molecule vibrate?

PHYSICS
A body accelerates from rest at 0.2m/s for one-fifth of a minute.Calculate the distance covered by the body.

Physics
A wild horse starts from rest and runs

Maths / physics
A blue ball travelling at 2m/s hits a red ball at rest on a table. after they collide both balls move in the same direction. Both balls have the same mass. The blue ball continues to move with a reduced velocity of 0.2m/s what is the velocity of the red ball?

Physics
A wild horse starts from rest and runs

Physics
A blue ball travelling at 2m/s collides with a red ball at rest on a table. After they collide, both balls move in the same direction. Both balls have the same mass. If the blue ball continues to move with a reduced velocity of 0.2m/s, what is the velocity of the red ball?

Physics 110
A pendulum suspendentfrom the roof of the bus moving along a horizontal track makes an angle of 5* with the vertical. 1. what forces are acting on the the pendulum bob? 2.Determine the acceleration of the bus?

Physics
A 1.45 kg book is sliding along a rough horizontal surface. At point A it is moving at 3.25 m/s , and at point B it has slowed to 1.34 m/s . Part A How much work was done on the book between A and B? Part B If -0.750 J of work is done on the book from B to C, how fast is it ...

  1. Pages:
  2. <<Prev
  3. 1
  4. 2
  5. 3
  6. 4
  7. 5
  8. 6
  9. 7
  10. 8
  11. 9
  12. 10
  13. 11
  14. 12
  15. 13
  16. 14
  17. 15
  18. Next>>

Homework Help: Science