# Homework Help: Science: Physics

## Recent Homework Questions About Physics

**physics**

An object of mass 1.00kg is moving over a horizontal circular path of radius 2.00m, with a speed of 3.00ms^-1. Determine: (a) its centripetal acceleration (b) its kinetic energy (c) its period (d) its angular velocity

*Sunday, November 6, 2016 by Stevie*

**Physics**

Two hockey pucks of equal mass are involved in a perfectly elastic, glancing collision, as shown in the figure below. The orange puck is initially moving to the right at voi = 3.95 m/s, when it strikes the initially stationary blue puck, and moves off in a direction that makes...

*Sunday, November 6, 2016 by Jessica*

**Physics FRICTION FORCE AND N-2ND LAW**

A balloon has a weight of 1250 N, and the lifting force on it is 3525N. If the air resistance is 15N, what is the acceleration of the balloon? (Notice fg=mg) 3525-15=3515 3515/1250= 2.81 ???? A pulling force on a case is 1653 N while the friction force is 765 N on the case. If...

*Sunday, November 6, 2016 by Physics*

**physics**

A mango fruit drops from the top of it's tree which is 40 m. How long does it takes to reach the ground

*Sunday, November 6, 2016 by miracle*

**Physics PROJECTILE AND CIRCULAR MOTION**

1.13g plastic stopper is attached to a 0.93-m string. The stopper is swung in a horizontal circle, making one revolution in 1.18s(period T). Find the tension force(equivalent to the centripetal force)exerted by the string on the stopper? (V=2(pie)r/T)? 2. A football is thrown ...

*Sunday, November 6, 2016 by Physics*

**Physics**

A child standing on a platform holds a rope taut at an angle θ to the vertical. The child swings from the platform starting from rest. When the child swings through the lowest position, the tension in the rope is 1.9 times the child's weight. Determine the value of θ.

*Sunday, November 6, 2016 by Ven Man*

**Physics**

Calculate the force of earths Gravity on a 2.00 earth radii above the earth surface if it's mass is 1850kg.

*Sunday, November 6, 2016 by Stuck*

**AP physics**

Astronauts who spend long periods in outer space could be adversely affected by weightlessness. One way to stimulate gravity is to shape the spaceship like a cylindrical shell that walking on the inside surface. Explain how this simulates gravity. Consider (a) how object fall...

*Sunday, November 6, 2016 by Susana*

**physics**

An ideal gas has the following initial conditions: Vi = 490 cm3, Pi = 5 atm, and Ti = 100°C. What is its final temperature if the pressure is reduced to 1 atm and the volume expands to 1000 cm3? ______ °C

*Sunday, November 6, 2016 by Katelyn*

**physics**

Three liters of nitrogen combine with 9 L of hydrogen to form 6 L of ammonia. If the molecules of nitrogen and hydrogen have two atoms each, how many atoms of hydrogen and nitrogen are there in one molecule of ammonia? ____ atoms of hydrogen ____ atoms of nitrogen

*Sunday, November 6, 2016 by Katelyn*

**physics**

1. A bullet of mass 10 g is fired vertically upward and it reaches to the highest point in 10 seconds. Which of the following figures is nearer to its maximum height above the firing position? A) 10 m B) 22 m C) 30 m D) 42 m E) None of the above

*Sunday, November 6, 2016 by Ghulam muhammad*

**physics**

A bomber drops a bomb from an aircraft flying at 2000Km/h with an altitude of 7 Km. The speed at which the bomb will strike the earth would be. a) Greater than 2000Km/h b) Less than 2000 Km/h c) Equal to 2000 Km/h d) Can not compare with the given data

*Sunday, November 6, 2016 by Ghulam muhammad*

**physics**

A duck is swimming across a river. The duck can swim at maximum speed of 2m\s in still water. If the duck i swimming as hard as possible straight across a river that running at 4m\s, what is the duck's overall speed, relative to the goose sitting on the river bank?

*Sunday, November 6, 2016 by atiyya*

**physics**

A boat is heading directly North acroos a river at 5km\h. The river is flowing east at 3km\h. a) what is the actual velocity of the boat? b) how far down stream does it land if the trip takes 0.5 hrs. c) how wide is the river?

*Sunday, November 6, 2016 by atiyya*

**physics**

A force of 300N lifts a mass of 120kg with help of lever whose length is 2.4 m.The distance between fulcrum and mass is a) 40cm b) 48cm c) 80cm d) 171cm

*Sunday, November 6, 2016 by Ghulam muhammad*

**physics**

a body is projected with velocity v1 from a point a at the same time another body is projected vertically upwards with velocity v2 the point b lies vertically below the height the point for both the bodies to collide 2/v should be

*Sunday, November 6, 2016 by teja*

**AP physics**

The earth moves faster in its orbits around the sun in January, or in July? Explain [Note: this is not much of a factor in producing seasons - the main factor is the tilt of the earths axis relative to the plane of its orbit.]

*Sunday, November 6, 2016 by Stuck*

**AP physics**

The sun is below us at a magnitude of nearly a line with the earth center. Are we then Heavier at midnight due to the sun's gravitational force on us, than we are at noon? Explain

*Sunday, November 6, 2016 by Stuck*

**Physics**

Why is more fuel required for spacecraft to travel from the earth to the moon than to return from the moon to the earth?

*Sunday, November 6, 2016 by Stuck*

**Physics**

Does an apple exert a gravitational force on the earth? If so, how large a force? Consider an apple (a) Attached to a tree and (b) falling.

*Sunday, November 6, 2016 by Stuck*

**AP physics**

Astronauts who spend long periods in outer space could be adversely affected by weightlessness. One way to stimulate gravity is to shape the spaceship like a cylindrical shell that walking on the inside surface. Explain how this simulates gravity. Consider (a) how object fall...

*Sunday, November 6, 2016 by Stuck*

**Physics**

A ball A having a speed of 44.0 ms-1 collides with another ball, B, of the same mass which is initially at rest. After the collision A is deflected, 45.0 from its initial direction and B moves off at an angle of 30.0° to the original direction of A. a. What is the nature ...

*Sunday, November 6, 2016 by Van*

**Physics**

A ball A having a speed of 44.0 ms-1 collides with another ball, B, of the same mass which is initially at rest. After the collision A is deflected, 45.0 from its initial direction and B moves off at an angle of 30.0° to the original direction of A. a. What is the nature ...

*Saturday, November 5, 2016 by Van*

**Physics**

A dike in Holland springs a leak through a hole of area 0.80 cm2 at a depth of 1.4 m below the water surface.How much force must a boy apply to the hole with his thumb to stop the leak? Could he do it?

*Saturday, November 5, 2016 by Ayla*

**Physics**

A cube of ice, 28 cm on each side,is melted into a measuring cup. What is the volume of the liquid water -------cm^3

*Saturday, November 5, 2016 by Beth*

**physics**

A cube with a mass of 40 g is made from a metal with a density of 6 g/cm3. What is the volume of the cube and the length of each edge? ----volume cm^3 -----length cm^3

*Saturday, November 5, 2016 by Beth*

**Physics**

A ship is first seen on a radar screen to be 9 km east of the radar site. Some time later, the ship is at 18km northwest. What is the displacement of the ship from the first location it is seen at? 25.2 km (INSERT ANGLE HERE?!?) degrees north of west

*Saturday, November 5, 2016 by Nathaniel*

**Physics**

A ship is first seen on a radar screen to be 9 km east of the radar site. Some time later, the ship is 18 km northwest. What is the displacement of the ship from the first location it is seen at?

*Saturday, November 5, 2016 by Nathaniel*

**physics**

A cube of ice, 28 cm on each side, is melted into a measuring cup. What is the volume of the liquid water? ------cm3

*Saturday, November 5, 2016 by Katelyn*

**physics**

A solid ball with a volume of 0.1 m3 is made of a material with a density of 2800 kg/m3. What is the mass of the ball? -----kg

*Saturday, November 5, 2016 by Katelyn*

**Advanced Physics**

What are the displacements for the following vectors? I. A vector moving 45 degrees northeast at a velocity of 3m/s and the turns 30 degrees southeast

*Saturday, November 5, 2016 by Chimpinde*

**physics (urgent)**

A flywheel with a moment of inertia of 1.00kg m^2 is rotating at 100 rpm. What torque is required to bring it to rest in 10.0 revolutions?

*Saturday, November 5, 2016 by paul*

**PHYSICS**

An aeroplane makes in emergency landing without landing gear. If the aeroplane touches down with a horizontal speed of 60.0ms^-1 and the coefficient of friction for aluminium on asphalt is μ = 0.500, how far will the aeroplane slide before coming to rest? You may assume that ...

*Saturday, November 5, 2016 by Steven*

**Physics**

An object of mass 1.00kg is moving over a horizontal circular path of radius 2.00m, with a speed of 3.00ms^-1. Determine: (a) its centripetal acceleration (b) its kinetic energy (c) its period (d) its angular velocity

*Saturday, November 5, 2016 by Tyrese*

**Physics - Gravitation**

Vesta, a minor planet in the Asteriod Belt between Mars and Jupiter, has a mean radius of 525 km and mass of 2.59 X 10^20 kg. The Dawn Spacecraft (m = 1240 kg) orbited Vesta in 2011 & 2012. How much energy did the spacecraft expend going from the 2750 km orbit to a 210 km ...

*Saturday, November 5, 2016 by Anon*

**Physics Gravitation Question**

Vesta, a minor planet in the Asteriod Belt between Mars and Jupiter, has a mean radius of 525 km and mass of 2.59 X 10^20 kg. The Dawn Spacecraft (m = 1240 kg) orbited Vesta in 2011 & 2012. A. Find the local acceleration due to gravity at the mean surface of Vesta. What is the...

*Saturday, November 5, 2016 by Anon*

**Physics Gravitation Question**

Vesta, a minor planet in the Asteriod Belt between Mars and Jupiter, has a mean radius of 525 km and mass of 2.59 X 10^20 kg. The Dawn Spacecraft (m = 1240 kg) orbited Vesta in 2011 & 2012. Find the local acceleration due to gravity at the mean surface of Vesta. What is the ...

*Saturday, November 5, 2016 by Anon*

**Physics**

A particle of mass m1 = 2.5 kg moving along the x axis collides with a particle of mass m2 = 4.9 kg initially at rest. The incoming particle is deflected in the direction 22 degrees above the x axis, whereas the target particle moves off at 15 m/s at 37 degrees below the x ...

*Saturday, November 5, 2016 by Ana*

**Physics**

A ship is first seen on a radar screen to be 9 km east of the radar site. Some time later, the ship is at 18 km northwest. What is the displacement of the ship from the first location?

*Saturday, November 5, 2016 by Nathaniel*

**physics**

A car is traveling at 60.6 mph on a horizontal highway. The acceleration of gravity is 9.8 m/s2. If the coefficient of friction between road and tires on a rainy day is 0.056, what is the minimum distance in which the car will stop? Answer in units of m.

*Saturday, November 5, 2016 by loren*

**Physics**

A horizontal forces of magnitude 500N pulls two blocks of masses m1=10 kg and m2=20 kg which are connected by the light inextensible string and lying on the horizontal frictionless surface. Find the tension in the strings and acceleration of each mass when forces is applied on...

*Saturday, November 5, 2016 by S*

**physics**

a duck is swimming across a river.The duck can swim at maximum speed of 2m\s in still water. If the duck is swimming as hard as possible straight across a river that is running at 4m\s, what is the duck's overall speed, relative to the goose sitting on the river boat?

*Saturday, November 5, 2016 by atiyya*

**physics**

A body is in equilibrium under the action of three force..one force is 4.0N acting due east and one is 5.0N in direction, 60°NE.calculate the magnitude of the third force.

*Saturday, November 5, 2016 by farima*

**Physics**

If your hands are wet and no towel is handy, you can remove some of the excess of water by shaking them. Why does this get rid of it?

*Saturday, November 5, 2016 by Amrit*

**Physics**

An airplane pilot wishes to fly due west. A wind of 80km/hr is blowing towards the south. a) If the speed of llane in air is 320km/hr, in which direction should the pilot head? b) What is the speed of plane over the ground? (Illustrate with diagram)

*Saturday, November 5, 2016 by Amrit*

**applied physics**

what angle do blue light wavelength of 460 nm and red light 680 nm disperse upon entering from vacuum to a dispersion medium with n(blue)=1.349 and n(red)=1.213 at an incident angle of 20 degree?

*Saturday, November 5, 2016 by jack isaiah*

**Physics**

A sample of ice at 0-degree melts after absorbing kJ of heat. How many kg of H20 are contained in the sample?

*Friday, November 4, 2016 by khalid*

**Physics**

How much energy must be removed from 30 L of liquid water at 0-degree celsius in order to convert it to ice?

*Friday, November 4, 2016 by khalid*

**physics**

An ideal gas has the following initial conditions: Vi = 490 cm3, Pi = 5 atm, and Ti = 100°C. What is its final temperature if the pressure is reduced to 1 atm and the volume expands to 1000 cm3? -----°C

*Friday, November 4, 2016 by Katelyn*

**Physics**

An airplane has a mass of 2.8×106 kg , and the air flows past the lower surface of the wings at 81 m/s . Part A: If the wings have a surface area of 1100 m2 , how fast must the air flow over the upper surface of the wing if the plane is to stay in the air? Express your answer...

*Friday, November 4, 2016 by Ashley*

**Physics**

In physics, work is defined as the product of the A) net force and the distance traveled B) net force parallel to the motion and direction traveled C) net force parallel to the motion and the time it is applied

*Friday, November 4, 2016 by Beth*

**AP Physics**

The length of the cannon barrel is 1.7 m and the cannon is aimed at a 38◦angle from the ground.The acceleration of gravity is 9.8 m/s^2. If Dread Pirate Roberts tells you he wants the ball to leave the cannon with speed V-not = 76 m/s, what mass cannon ball must you use? ...

*Friday, November 4, 2016 by Connor*

**Physics**

A "swing" ride at a carnival consists of chairs that are swung in a circle by 17.9 m cables attached to a vertical rotating pole, as the drawing shows. Suppose the total mass of a chair and its occupant is 193 kg. (a) Determine the tension in the cable attached to the chair. (...

*Friday, November 4, 2016 by BrookeNeed*

**Physics**

) A car is traveling on a straight, horizontal road at 20 m/s when the driver slams on the brakes. The force of friction between the car and the road is 900 N. The mass of the car is 1800 kg. (a) Make a free body diagram for the car on the set of axes provided. (b) How far ...

*Friday, November 4, 2016 by Tommy*

**physics**

if a swimmer can swim in still water at a speed of 7.3 m/s and he intends to swim across a river that has a downstream current of 2.5 m/s what is the swimmers direction?

*Friday, November 4, 2016 by Lily*

**Physics**

For a certain projectile, the horizontol range is twice in magnitude of the maximum height attained by it. Find its angle of projection.

*Friday, November 4, 2016 by Amrit*

**Physics**

Rain drops hitting the side window of a car in motion often leave diagonal streaks if there is no wind. Why?

*Friday, November 4, 2016 by Amrit*

**Physics**

An electric train leaves a station starting from rest and attains a speed of 72km/hr in 10 second. Then it undergoes uniform retardation for 20 second to come to halt at the next station then calculate i) the distance between the train stations. ii) the average velocity of train.

*Friday, November 4, 2016 by Amrit*

**Physics**

Two workers pull horizontally on a heavy box, but one pulls twice as hard as the other. The larger pull is directed at 25 degree west of north and the resultant of these two pulls is 350 netwon directly northward. Use vector components to find the magnitude of each of these ...

*Friday, November 4, 2016 by Amrit*

**Physics**

Two boxes are stacked in an elevator that is accelerating downwards at 3.49m/s/s. A smaller 3.06kg box is on top and a larger 9.93kg box is on bottom. Find the magnitude and direction of the force that the smaller mass exerts on larger.

*Friday, November 4, 2016 by Josh*

**Physics**

Ice floats with one ninth of its volume above water. What is the relative density of ice?

*Friday, November 4, 2016 by Kity*

**Physics**

A flywheel with a moment of inertia of 1.00kg m^2 is rotating at 100 rpm. What torque is required to bring it to rest in 10.0 revolutions?

*Friday, November 4, 2016 by Tyrese*

**PHYSICS (REALLY DIFFICULT PLEASE HELP)**

An aeroplane makes in emergency landing without landing gear. If the aeroplane touches down with a horizontal speed of 60.0ms^-1 and the coefficient of friction for aluminium on asphalt is μ = 0.500, how far will the aeroplane slide before coming to rest? You may assume that ...

*Friday, November 4, 2016 by Steven*

**Physics**

An object of mass 1.00kg is moving over a horizontal circular path of radius 2.00m, with a speed of 3.00ms^-1. Determine: (a) its centripetal acceleration (b) its kinetic energy (c) its period (d) its angular velocity

*Friday, November 4, 2016 by Damon*

**Physics**

A ball of mass 0.1kg dropped from a building of 8m high unto a hard floor bounces back to a height of 2m. Calculate the change in momentum , if the ball is in constant with the floor of 0.1s, what is the force exerted on the body . (g = 10ms)

*Friday, November 4, 2016 by Lauryn*

**physics**

A vector moving 45 degrees northeast at a velocity of 3m/s and the turns 30 degrees southeast with a velocity of 10m/s.

*Friday, November 4, 2016 by Musonda icu*

**Physics**

At the surface of a certain planet, the gravitational acceleration g has a magnitude of 12.0 m/s^2. A 21.0-kg brass bell is transported to this planet. What is (a) the mass of the brass ball on the Earth and on the planet, and (b) the weight of the brass ball on the Earth and ...

*Friday, November 4, 2016 by Luce*

**Physics**

A fire helicopter carries a 358 kg bucket at the end of a 10.4 m long cable. When the helicopter is returning from a fire at a constant speed of 51.4 m/s, the cable makes an angle of 23.7◦ with respect to the vertical. Find the horizontal force exerted by air resistance on ...

*Thursday, November 3, 2016 by well*

**Physics**

Why may someone not be able to cooled by evaporation?

*Thursday, November 3, 2016 by Ashley*

**Physics**

Assume a person expends mechanical energy at a rate of 450 W. If they were 15% efficient, what would be the rate at which he/she generates waste heat energy?

*Thursday, November 3, 2016 by Ashley*

**Physics**

An adult dolphin weighs around 1460 N. How fast must he be moving as he leaves the water vertically in order to jump to a height of 2.90 m? Ignore air resistance.

*Thursday, November 3, 2016 by Victoria*

**physics**

A small disk of radius r is glued onto a large disk of radius R that is mounted on a fixed axle through its center. the combined moment of inertia of the disks is I. A string is wrapped around the edge of the small disk and a box of mass m is tied to the end of the string. the...

*Thursday, November 3, 2016 by Anonymous*

**Physics**

passenger must experience no greater than 10 times the magnitude of the acceleration due to gravity as the spring cushions their fall & brings the elevator to rest. Calculate the spring constant assume mass of elevator and passenger is 'M' kg. what is the spring constant so ...

*Thursday, November 3, 2016 by Sherry*

**physics**

Two crates rest on top of one another.There is a crate of mass 4.62 kg on top of another crate of mass 2.19 kg. The coefficient of friction between the lower crate and the floor is μk = 0.440 and the coefficient of static friction between the two crates is μs = 0.870. If the...

*Thursday, November 3, 2016 by 2FUN*

**physics**

A ball is thrown horizontally off a building that is 30 m high with an initial velocity of 3 m/s.if an identical ball is thrown again horizontally from the same height with 6 m/s, what happens to the flight time? I have to use the guess method. Givens Unknown Equation ...

*Thursday, November 3, 2016 by Faith*

**Physics**

A mass is tied to a 1 m string. The string is attached to a point on a horizontal frictionless surface and the mass is set into circular motion. The string will break if tension becomes larger than 10 N. The maximum kinetic energy that the mass can achieve before the string ...

*Thursday, November 3, 2016 by Anonymous*

**physics**

A body moving with a velocity of 3m/s is brought to rest by a constant force after travelling 15m, calculate the retardation.

*Thursday, November 3, 2016 by taiwo*

**Physics**

A)A 100kg person is riding a 10kg bicycle up a 25degree hill. The hill is long and the coefficient of static friction is 0.9. How much force does the person have to apply in order for her to ride 10m up the hill at constant velocity? B) If the person now starts from rest from ...

*Thursday, November 3, 2016 by Alex*

**Physics Urgent!**

Please help! This is due in three hours and I don't know how to do these! 1.A block accelerates at 3.1 m/s2 down a plane inclined at an angle 24.0◦. Find μk between the block and the inclined plane. The acceleration of gravity is 9.81 m/s2 . 2.Two blocks connected by a ...

*Thursday, November 3, 2016 by Mikayla*

**Physics**

If a particle takes two revolution in one sec & it took five revolution .Find angular velocity of particle.

*Thursday, November 3, 2016 by Asmita*

**physics -damon help**

An ac source of 50v,100÷πHz is connected in series with an inductor of inductance L ad a resistor of resistance R.the current in the circuit is 2A ad p.d. across L and R are 30v ad 40v respectively 1) calc d average power dissipated 2) calc d power factor in the circuit

*Thursday, November 3, 2016 by maths*

**Physics**

1. A 1200 kg car moves along a horizontal road at speed v0 = 20.1 m/s. The road is wet, so the static friction coefficient between the tires and the road is only μs = 0.189 and the kinetic friction coefficient is even lower, μk = 0.1323. The acceleration of gravity is 9.8 m/...

*Thursday, November 3, 2016 by Devika*

**Physics**

1. A snowboarder of mass 60 kg is at rest on the top of a sand dune. The coefficients of static and kinetic friction are 0.55 and 0.4675, respectively. 60 kg μk = 0.4675 μs = 0.55 What is the angle the incline must exceed so that the snowboarder starts sliding? The ...

*Thursday, November 3, 2016 by Mikayla*

**Physics**

A 1200kg car rounds a curve of radius of 50m with a speed of 80km/hr. What is the coefficient of friction if the car is just about to skid off the road? I got: ac= 9.88m/s2 Fc= 11851N I also know Ff=uFN but have no idea how to figure this out. Thx.

*Wednesday, November 2, 2016 by Deanna*

**Physics**

A rod is lying on the top of a table. One end of the rod is hinged to the table so that the rod can rotate freely on the tabletop. Two forces, both parallel to the tabletop, act on the rod at the same place. One force is directed perpendicular to the rod and has a magnitude of...

*Wednesday, November 2, 2016 by Lisa Johnson*

**physics**

A 3 kg block (block A) is released from rest at the top of a 20 m long frictionless ramp that is 5 m high. At the same time, an identical block (block B) is released next to the ramp so that it drops straight down the same 5 m. Find the values for each of the following for the...

*Wednesday, November 2, 2016 by Katelyn*

**Physics**

A 3.2 Kg box is pressed up against a wall by a person’s arm that makes a 35-degree angle with the wall. The box slides down the wall with a uniform speed. There is a coefficient of friction of 0.45 between the box and the wall. A. What is the magnitude the force that the ...

*Wednesday, November 2, 2016 by Grant buttler*

**Physics**

QUESTION: In the figure provided, a 2.83 kg textbook is connected by a string to a 0.970 kg cup. The textbook is pushed up a slope of 34.7° with an initial speed of 2.81 m/s. If the coefficients of friction are uk = 0.370 and Îus = 0.760 with the surface, how far will the ...

*Wednesday, November 2, 2016 by Haniah*

**Physics**

A 1200 kg car moves along a horizontal road at speed v0 = 20.1 m/s. The road is wet, so the static friction coefficient between the tires and the road is only μs = 0.189 and the kinetic friction coefficient is even lower, μk = 0.1323. The acceleration of gravity is 9.8 m/s2...

*Wednesday, November 2, 2016 by Mikayla*

**Physics**

a) Rain drops hitting the side window of a car in motion often leave diagonal streaks if there is no wind. Why? b) For a certain projectile, the horizontal range is twice in magnitude of the maximum height attained by it. Find its angle of projection.

*Wednesday, November 2, 2016 by Eliza*

**Physics**

Two workers pull horizontally on a heavy box, but one pulls twice as hard as the other. The larger pull is directed at 25 degree west of north and the resultant of these two pulls is 350 netwon directly northward. Use vector components to find the magnitude of each of these ...

*Wednesday, November 2, 2016 by Amrit*

**Physics**

An automobile is travelling west. Can it have velocity towards west and at the same time can it have acceleration towards the east? Under what circumstances.

*Wednesday, November 2, 2016 by Amrit*

**physics**

A 1200 kg car traveling north at 14 m/s is rear ended by a 2000 kg truck traveling at 25 m/s. If the truck and car lock bumpers and stick together, what is their speed immediately after the collision?

*Wednesday, November 2, 2016 by Katelyn*

**Physics Urgent!**

A snowboarder of mass 60 kg is at rest on the top of a sand dune. The coefficients of static and kinetic friction are 0.55 and 0.4675, respectively. 60 kg μk = 0.4675 μs = 0.55 What is the angle the incline must exceed so that the snowboarder starts sliding? The ...

*Wednesday, November 2, 2016 by Mikayla*

**Physics**

At what altitude above the Earth's surface is the gravitational field strength equal to g/7? .981 = -(1.0003322(6,371/6,371+h))^2)

*Wednesday, November 2, 2016 by Denise*

**Physics**

1.A block accelerates at 3.1 m/s2 down a plane inclined at an angle 24.0◦. Find μk between the block and the in- clined plane. The acceleration of gravity is 9.81 m/s2 . 2.A 1200 kg car moves along a horizontal road at speed v0 = 20.1 m/s. The road is wet, so the static ...

*Wednesday, November 2, 2016 by Casey*

**Physics**

1.A student moves a box of books down the hall by pulling on a rope attached to the box. The student pulls with a force of 181 N at an angle of 20.8◦ above the horizontal. The box has a mass of 40.3 kg, and μk between the box and the floor is 0.29. The acceleration of ...

*Wednesday, November 2, 2016 by Alana*

**Physics Urgent!**

1.You are driving at the speed of 28.7 m/s (64.2138 mph) when suddenly the car in front of you (previously traveling at the same speed) brakes. Considering an average human reaction, you press the brakes 0.427 s later. Assume that the brakes on both cars are fully engaged and ...

*Wednesday, November 2, 2016 by Mikayla*

**Physics**

A hockey puck is hit on a frozen lake and starts moving with a speed of 12.1 m/s. Four seconds later, its speed is 6.7 m/s. What is its average acceleration? The ac- celeration of gravity is 9.8 m/s2 . Answer in units of m/s2. What is the average value of the coefficient of ...

*Wednesday, November 2, 2016 by Mikayla*

**physics**

A 3 kg block is released from rest at the top of a 20 m long frictionless ramp that is 5 m high. Find the values for the block just before it reaches ground level. (a) gravitational potential energy ----J (b) kinetic energy ----J (c) speed -----m/s (d) momentum ------kg·m/s

*Wednesday, November 2, 2016 by Sue*