# Homework Help: Science: Physics

## Recent Homework Questions About Physics

**Physics**

An angle of a circle with a 2 m radius is delta theta = 20 degree. What is the corresponding arc length delta s?

*Sunday, November 20, 2016 by Mary*

**Physics**

The block of mass 3.43553 kg has an acceleration of 2.1 m/s^2 as shown. / / F a _____________ <-/ )23 degree <---- |_3.43553kg_| What is the magnitude of F? Assume the acceleration due to gravity is 9.8 m/s^2 and the surface is frictionless. Answer in units of N

*Sunday, November 20, 2016 by Jules*

**physics**

A water is operated by solar power. If the solar collector has an area of 5.25m2, and the intensity delivered by sunlight is 475W/m2, how long does it take to increase the temperature of .600m3 of water from 20.C to 85.0C?

*Sunday, November 20, 2016 by Amie J.*

**physics**

Two moles of an ideal gas have a volume of 3.43X10-3m3. the initial temperature of the gas is 78.0C. If the pressure is held constant while it is heated to a final temetatue of 275C, what would be the final volume?

*Sunday, November 20, 2016 by Amie J.*

**physics**

A .524kg object is tied down to the bottom of a container which container an unknown fluid. the tension in the rope is 38.5N. the object displaces .00735m3 of unknown fluid. Find the density of the unknown fluid.

*Sunday, November 20, 2016 by Amie J.*

**Physics**

A wheel is rotating with angular velocity 14 rev/s. What angular acceleration would be needed to bring the wheel to rest in a single rotation?

*Sunday, November 20, 2016 by Mary*

**physics**

Two forces are exerted on a hockey puck which initially stopped on frictionless ice. Force 1 is exerted in the positive x direction with magnitude of 10 N and Force 2 is exerted in the positive Y direction with magnitude 4 N. The hockey puck has a mass of 0.5 kg. What is the ...

*Sunday, November 20, 2016 by Sue*

**Physics**

0 degree centigrade temperature cause 300m/s2 how many centigrade temperature cause 400 m/s2 velocity

*Sunday, November 20, 2016 by Ghost*

**Physics**

An electric heater supplied at 40 Volt's draws a current of 5 ampere. If it is now connected to a 120 Volt supply, find the value of current being drawn ?

*Sunday, November 20, 2016 by Kartik*

**Physics**

A nichrome wire of diameter 5mm and length 5m has resistivity of 10^-4 ohm meter. If wire is compressed to double it's diameter. Find the resistance in its new form. Also find the resistance of the wire originally ?

*Sunday, November 20, 2016 by Kartik*

**physics**

A uniform rod of 1 meter is bent at its midpoint to make90.The distance from its centre of mass

*Sunday, November 20, 2016 by girija*

**physics**

If your car goes from 0 mi/h to 70 mi/h in 8 s, what is your average acceleration? Answer in units of miles/(hours x seconds ).

*Saturday, November 19, 2016 by Zoe*

**physics**

One day while moving boxes you get tired and decide to use a rocket instead. You attach a small rocket of negligible mass to a 6.45 kg box. When you turn the rocket on, it provides a constant thrust of 212 N, and the sbox begins sliding across the pavement. If the magnitude of...

*Saturday, November 19, 2016 by Fb*

**physics**

A uniform plank AB which is 75m long and has a weight of 350N and is supported horizontally by two vertical ropes A and B. A weight of 100N rest on the plank at C where AC=4m. Find the tension in each rope A and B

*Saturday, November 19, 2016 by atiyya*

**physics**

A girl uses a spanner of length 20cm to tighten a nut. If she pulls at right angles to the end of the spanner with a force of 50N,calculate the moment of her pull

*Saturday, November 19, 2016 by atiyya*

**Physics**

A 3.20 kg block starts at rest and slides a distance d down a frictionless 30.0° incline, where it runs into a spring (Fig. 8-6). The block slides an additional 23.0 cm before it is brought to rest momentarily by compressing the spring, whose spring constant k is 443 N/m. Fig...

*Saturday, November 19, 2016 by Alex*

**Physics**

You demonstrate hitting a board in a karate class. The speed of your hand as it hits the thick board is 12 m/s with respect to the board, and the mass of your hand is about 0.74 kg. How deep does your hand go into the board before stopping if the collision lasts for 2.0×10−3s?

*Saturday, November 19, 2016 by Bob*

**Physics**

What role does the mass of the projectile play in changing the horizontal and vertical motions of the projectile? Why? Thank you!

*Saturday, November 19, 2016 by Louren*

**Physics**

A car with its passengers have a total mass of 4200kg .the car is travelling along a horizontal road when it moves ,it experiences a forward driving force of magnitude F newtons and a constant resistance force(opposite to driving force)of 850N a)what is the value of F if the ...

*Saturday, November 19, 2016 by Ali*

**Physics**

A beam of partially polarized light can be considered to be a mixture of polarized and unpolarized light. Suppose a beam of partially polarized light is sent through a polarizing filter. The polarization direction of the filter can be changed by rotating it. As the filter is ...

*Friday, November 18, 2016 by Po*

**Physics**

A wheel accelerates from rest to 59 rad/s at a rate of 58 rad/s^2 What is the angular displacement of the wheel??? A) 24 rad B) 38 rad C) 30 rad

*Friday, November 18, 2016 by Katelyn*

**Physics**

A 3500kg truck moving at 45km/h collided head on with a 1600kg car moving at 25km/h. Find the velocity of the combined cars after the collision.

*Friday, November 18, 2016 by Sumeet*

**Physics**

A pipe is open at both ends. The pipe has resonant frequencies of 655 Hz and 786 Hz (among others). Find the two lowest possible values for the length of the pipe. Use c = 343 m/s for the speed of sound. __ m __ m?

*Friday, November 18, 2016 by Jackson*

**physics**

A 6.95 kg bowling ball is dropped 2.20 m onto a large spring. If the bowling ball compresses the spring by 0.55 m, what must the spring constant of the spring be?

*Friday, November 18, 2016 by Cristiano*

**physics**

A spring gun shoots out a plastic ball at speed v0. If the ball's speed is increased by a factor of 2, what distance must the spring have been compressed?

*Friday, November 18, 2016 by Kevin*

**Physics**

Calculate the kinetic energy that the earth has because of (a) its rotation about its own axis and (b) its motion around the sun. Assume that the earth is a uniform sphere and that its path around the sun is circular. For comparison, the total energy used in the United States ...

*Friday, November 18, 2016 by BrookeNeed*

**Physics**

An object is sliding along a flat surface with an initial speed of 30 m/s. What must the coefficient of kinetic friction be between the object and the surface if the object slides to a stop in 10m? What would be the speed of the object after it had only slide half that distance?

*Friday, November 18, 2016 by Kay*

**physics**

A mass of 8kg is whirled round in a vertical circle using a rope of length 80cm if it makes 2.5 cycles in 1 second, calculate the maximum tension the rope experiences

*Friday, November 18, 2016 by dyna*

**Physics**

A 52 kg woman is standing in a 26 kg cart that is moving a velocity of 1.2 m/s S. The woman staying rest then moves at a velocity of 1m/s (E) what is the final velocity of the cart? I just ugh, don't even know how to even start answering the question as this deals with ...

*Friday, November 18, 2016 by Anna*

**physics**

A steel spring is hung vertically. Using a ruler, the lower end of the spring was measured to be 25.0cm from its upper end. However, when an object of mass 0.500kg it attached to the lower end of the spring the spring stretches to a new length of 45.0cm. With the aid of a ...

*Friday, November 18, 2016 by Jack*

**PHYSICS**

Consider a solid ball of mass m = 50g and is placed on a long flat slope that makes an angle of 30° to the horizontal. The ball was initially at rest and was then released such that it rolled down the slope without slipping. With a detailed explanation of your method ...

*Friday, November 18, 2016 by Liam*

**Physics**

An empty SG bottle weights 25 g.When filled with water completely it weights 55 g and with alcohol it weights 48 g. Find the RD of alcohol A numerical

*Friday, November 18, 2016 by .*

**Physics**

An empty SG bottle weights 25 g.When filled with water completely it weights 55 g and with alcohol it weights 48 g. Find the RD of alcohol A numerical

*Friday, November 18, 2016 by Anonymous*

**Physics**

An empty SG bottle weights 25 g.When filled with water completely it weights 55 g and with alcohol it weights 48 g. Find the RD of alcohol A numerical

*Friday, November 18, 2016 by Anonymous*

**Physics**

An empty SG bottle weights 25 g.When filled with water completely it weights 55 g and with alcohol it weights 48 g. Find the RD of alcohol A numerical

*Friday, November 18, 2016 by Anonymous*

**physics**

a bullet of mass 0.05 kg strikes a wooden block of mass 5 kg and becomes embedded within the block. The block and bullet then fly off at 10 m/s after the collision. What was the original velocity of the bullet if the block was initially at rest?

*Thursday, November 17, 2016 by kaylee*

**Physics**

The active element of a certain laser is an ordinary glass rod 19.5 cm long and 1.04 cm in diameter. If the temperature of the rod increases by 77.3°C, calculate its increase in length.Calculate its increase in volume. Calculate its increase in diameter. (Use 9.0×10-6 °C-1 ...

*Thursday, November 17, 2016 by Ashley*

**physics**

A plane landing on a small tropical island has just 50 m of runway on which to stop. If its initial speed is 47 m/s, what is the maximum acceleration of the plane during landing, assuming it to be constant? Answer in units of m/s 2 .

*Thursday, November 17, 2016 by mahnoor*

**Physics**

Dana has set up a target for her toy spring gun. The gun requires 5.50 g pellets as ammunition that travel 11.4 m/s when shot. If the spring inside has maximum compression of 0.0700 m, what is the spring constant for the spring in the toy gun?

*Thursday, November 17, 2016 by Hard Question*

**physics**

A 3.35g lead bullet at 31.0°C is fired at a speed of 255 m/s into a large block of ice at 0°C, in which it embeds itself. What quantity of ice melts?

*Thursday, November 17, 2016 by taylor*

**physics**

An automobile accelerates from rest at 0.9 m/s 2 for 25 s. The speed is then held constant for 18 s, after which there is an acceleration of −5.8 m/s 2 until the automobile stops. What total distance was traveled? Answer in units of km

*Thursday, November 17, 2016 by ken*

**Physics**

A 40 kg child start from rest and travels 4 m down a slide that is inclined 35 degree to the horizontal. If her speed at the bottom is 2.5 m/s , what was the frictional force along the slide?

*Thursday, November 17, 2016 by Ali*

**physics**

Consider a solid ball of mass m = 50g and is placed on a long flat slope that makes an angle of 30° to the horizontal. The ball was initially at rest and was then released such that it rolled down the slope without slipping. With a detailed explanation of your method ...

*Thursday, November 17, 2016 by Liam*

**physics**

A steel spring is hung vertically. Using a ruler, the lower end of the spring was measured to be 25.0cm from its upper end. However, when an object of mass 0.500kg it attached to the lower end of the spring the spring stretches to a new length of 45.0cm. With the aid of a ...

*Thursday, November 17, 2016 by Jack*

**Physics**

What is simple harmonic motion or SHM?

*Thursday, November 17, 2016 by Ousman*

**Physics**

An object is projected from a satellite orbiting 200 km above the surface of the earth. The object has a speed relative to the Earth of 2.85×104 m/s. What is its speed when it is very far from the earth?

*Thursday, November 17, 2016 by James*

**Grade 11 Physics**

Harry, who has a mass of 54 kg, has just gotten a flybar pogo stick and is standing on top of a small wall. He pushes off the wall with a velocity of 1.7 m/s, gets on the stick and lands. The stick has a spring constant of 3.5 x 104 N/m and he compresses it by 20.0 cm when he ...

*Thursday, November 17, 2016 by Michelle*

**Physics**

You are lawn bowling and bowl a ball with a speed of 5.00 m/s. Unfortunately, your ball hits a large rock of mass 400 g, resulting in a perfectly elastic collision. If the final velocity of the ball after the collision is -2.93 m/s, what must the mass of the ball be

*Wednesday, November 16, 2016 by Physics Lover*

**Physics**

A 21700 kg train is reaching the end of the line. In order to slow down, the front of the train snags a cable that is attached to a spring. If the spring has a spring constant of 73400 N/m and the train's initial speed is 53.0 m/s, how much will the spring stretch to stop the ...

*Wednesday, November 16, 2016 by Physics Lover*

**Physics**

A meter stick whose mass is 0.200 kg is supported at the zero cm mark by a knife edge and a force F at the 100 cm point. A mass of 700 grams is attached to the stick at 40 cm mark. Find the magnitude of N and F in Newton's.

*Wednesday, November 16, 2016 by Lauren*

**Physics**

You throw a 238 g baseball straight up from a height of 1.73 m and it reaches a height of 13.2 m. Using conservation of energy, what minimum initial speed is needed to accomplish this?

*Wednesday, November 16, 2016 by Physics Lover*

**physics**

A 2.0 g bullet is shot with an initial velocity of 200.0 m/s into a board (I = 12.0 kg m2). The board is held still by a frictionless pivot a third away from its bottom end, as shown below. Assume that you can treat the board as a uniform rod. 1. What is the initial angular ...

*Wednesday, November 16, 2016 by anna*

**Physics**

A 4.0 g bullet is shot with an initial velocity of 300.0 m/s into a board (I = 19.0 kg m2). The board is held still by a frictionless pivot a third away from its bottom end, as shown below. Assume that you can treat the board as a uniform rod. 1) What is the initial angular ...

*Wednesday, November 16, 2016 by Sara S*

**Grade 11 Physics**

Megan and Catrina are at a playground swing set. Catrina pulls Megan back so that the 2.5 m long chain makes a 35 angle with the vertical. She pushes her with a speed of 6.5 m/s and Megan begins to swing forward. a) What is Megan’s fastest speed? b) How fast is Megan ...

*Wednesday, November 16, 2016 by Alexis*

**applied physics**

An object is thrown vertically up ward from the ground with initial velocity 1960cm/s Neglecting air resistance, find the maximum height reached and the total time taken to return to the straight point ,/using first order differential equations/

*Wednesday, November 16, 2016 by Ermiyas Abas*

**Physics**

a 30.0 g particle is released from rest at x = 5 J. What is the speed of the particle at x = 0 J?

*Wednesday, November 16, 2016 by Speed Ratio*

**Physics**

What is the speed ratio (vA/vB) if particle A has 6 times the kinetic energy and half the mass of particle B? 3.46 1.73 2.45 0.289

*Wednesday, November 16, 2016 by Speed Ratio*

**Physics**

One end of a spring is attached to a wall and Jamie pulls on the other end of the spring with a force of 200 N, stretching the spring by 11.5 cm. If Jason takes the end of the spring off of the wall and they both pull the spring with a force of 200 N, how far will the spring ...

*Wednesday, November 16, 2016 by Physics Lover*

**physics**

The figure shows an overhead view of a 3.00-kg plastic rod of length 1.20 m on a table. One end of the rod is attached to the table, and the rod is free to pivot about this point without friction. A disk of mass 37.0 g slides toward the opposite end of the rod with an initial ...

*Wednesday, November 16, 2016 by Amy*

**Physics**

compute for the power while pushing an object by a 200N force making 18 degrees above the horizontal covering a distance of 7.5m in 0.5 minute?

*Wednesday, November 16, 2016 by Anonymous*

**Physics**

Francesca dangles her watch from a thin piece of string while the jetliner she is in accelerates for takeoff, which takes about 11 s . Tap image to zoom . Part A Estimate the takeoff speed of the aircraft if the string makes an angle of 25∘ with respect to the vertical.

*Wednesday, November 16, 2016 by Destani*

**Physics**

Air conditioners sold in the United States are given a seasonal energy-efficiency ratio (SEER) rating that consumers can use to compare different models. A SEER rating is the ratio of heat pumped to energy input, similar to a COP but using English units, so a higher SEER ...

*Wednesday, November 16, 2016 by Morgyn*

**Physics**

The record time for a Tour de France cyclist to ascend the famed 1100-m-high Alpe d'Huez was 37.5 min, set by Marco Pantani in 1997. Pantani and his bike had a mass of 65 kg. Assume the body works with 25 % efficiency. A)How many Calories did he expend during this climb? B)...

*Wednesday, November 16, 2016 by Morgyn*

**Physics**

A ceiling fan draws a current of 0.625 A and has a voltage of 120 V. The resistance of the ceiling fan, to the nearest tenth?

*Wednesday, November 16, 2016 by Vivian*

**physics**

A system consists of a 0.130-kg chunk of ice floating in 1.12 kg of water, all at 0 ∘C. Part A How much thermal energy must be added to the system to convert it to 1.25 kg of water at 15.0 ∘C?

*Wednesday, November 16, 2016 by ......*

**Physics**

A spring gun shoots out a plastic ball at speed v0. If the ball's speed is increased by a factor of 5, what distance must the spring have been compressed?

*Wednesday, November 16, 2016 by First Name*

**Physics**

A rectangular object has a width of 40 meters, height of 15 meters, and length of 2 meters. It floats consistently when 3 meters of its height is below the surface of the water. 1. Find the volume of the displaced water. - Is this the same as the volume of the object?

*Wednesday, November 16, 2016 by Anonymous*

**Physics**

A roller-coaster car rolls down a track, reaching a speed of v0 at the bottom. If the height of the track is increased by a factor of 2.00, assuming the track is frictionless, by what factor will the speed at the bottom increase?

*Wednesday, November 16, 2016 by ._.*

**physics**

One end of a spring is attached to a wall and Jamie pulls on the other end of the spring with a force of 100 N, stretching the spring by 19.5 cm. If Jason takes the end of the spring off of the wall and they both pull the spring with a force of 100 N, how far will the spring ...

*Wednesday, November 16, 2016 by Anonymous*

**Physics**

a great of effort, time, and money has been spent in the quest for the so-called perpetual-motion machine, which is defined as a hypothetical machine that operates or produces useful work indefinitely and/ or a machine that produces more work or energy than it consumes. ...

*Wednesday, November 16, 2016 by John*

**Physics**

the human body is only about 25 % efficient at converting input chemical energy to useful work. where does the rest of the input chemical energy go?

*Wednesday, November 16, 2016 by John*

**Physics**

A quartz sphere is 14.0 cm in diameter. What will be its change in volume if its temperature is increased by 305 °F? (the coefficient of volume expansion of quartz is (1.50 × 10^-6) °C-1) Answer in cm^3 I tried this twice and got 0.657 cm^3 and 0.18cm^3 but they are both ...

*Wednesday, November 16, 2016 by Kayla*

**physics**

a ball moving witha speed of 9m/s sttrikes an identical ball such that after collison ,the direction of each ball makes an angle of 30 with original line of motion. if K1 and K2 are the kinetic energies before and after collision the A) K1< K2 b) K1> K2 c)K1=K2

*Wednesday, November 16, 2016 by Aabha*

**Physics**

The popular Super Soaker water guns are powered by compressed air (provided by a hand pump used by the operator.) A certain model has a cylindrical reservoir (where the water is held) 8.00 cm in diameter and a barrel (where the water leaves the gun) 1.00 cm in diameter. If ...

*Wednesday, November 16, 2016 by Ernan*

**Physics**

A cylindrical log of uniform density and radius 20.0 cm floats so that the vertical distance from the water line to the top of the log is 8.00 cm. What is the density of the log? (Hint: draw a good picture of the circular end of the log.)

*Wednesday, November 16, 2016 by Ernan*

**Physics**

A mass m at the end of a spring oscillates with a frequency of 0.83 Hz . When an additional 770 g mass is added to m, the frequency is 0.65 Hz . Part A What is the value of m? Express your answer to two significant figures and include the appropriate units. Milligrams --> Kg

*Tuesday, November 15, 2016 by Ashley*

**Physics**

You exert a force of 26 N on the head of a thumbtack. the head of the thumbtack has a radius of 7 mm.? What is the pressure on your thumb? -------- atm

*Tuesday, November 15, 2016 by Katelyn*

**Physics**

A car is proceeding at a speed of 14.0 m/s when it collides with a stationary car in front. During the collision, the fist car moves a distance of 0.350 m as it comes to a stop. The driver is wearing her seat belt, so she remains in her seat during the collision. The driver’...

*Tuesday, November 15, 2016 by Nick*

**Physics**

Robert constructs the apparatus shown and slides a block down a slope that is without friction until the block reaches the section, L, of length 1.85 m, which begins at height h2 = 2.0 m on a ramp of angle 30.0°. In that section, the coefficient of kinetic friction is 0.70. ...

*Tuesday, November 15, 2016 by Alexis*

**physics**

Acceleration of a Mass in a Pulley System Block 1 of mass m1 slides on a frictionless plane inclined at angle θ with respect to the horizontal. One end of a massless inextensible string is attached to block 1. The string is wound around a frictionless movable pulley P of ...

*Tuesday, November 15, 2016 by simon*

**PHYSICS**

A 6.53-kg block initially at rest is pulled to the right along a horizontal surface by a constant force of 125 N applied at an angle θ above the horizontal. The coefficient of kinetic friction between the block and the horizontal surface is 0.150. At what angle θ above the ...

*Tuesday, November 15, 2016 by ROMAN*

**physics**

A basketball explodes into three separate pieces. Two pieces of equal mass shoot off at 20.3 m/s, one travelling to the south and one to the west, perpendicular to each other. The third piece has a mass 4 times the size of one of the other pieces. What is the speed of the ...

*Tuesday, November 15, 2016 by HELP!!!*

**physics**

What is the force constant of a spring which is stretched 2mm by a force of 4N

*Tuesday, November 15, 2016 by amie*

**Physics**

a transverse wave on a string has a period of 0.1 s and an amplitude of 1 cm. What is the maximum transverse acceleration at any point along the string?

*Tuesday, November 15, 2016 by Mona*

**university physics**

A 5.20 g pellet is shot horizontally from a BB gun at a speed of 29.1 m/s into a 20.8 g wooden block. The wooden block is attached to a spring and lies on a frictionless table. If the collision is inelastic and the spring constant k = 22.0 N/m, what is the maximum compression ...

*Tuesday, November 15, 2016 by lily*

**physics**

A car brakes at constant acceleration from a velocity 226m/s to 12.5m/s over a distance of 105m.find; a)How much time elapses during this time interval. b)what is the acceleration. c)if the car continued to be braked at same constant acceleration how much longer would it take ...

*Tuesday, November 15, 2016 by claire*

**physics**

A body is in equilibrum when three forces act on it.Two of the forces are F1 of magnitude 8Newtons acting due east and F2 which is 5Newtons acting 060. find the magnitude and direction of the third force.

*Tuesday, November 15, 2016 by joe*

**Physics**

In what two positions will a converging lens form images of a luminous object on a screen located 40.0cm from the object?

*Tuesday, November 15, 2016 by Anonymous*

**PHYSICS**

A force of 0.65 N is required to hold a spring extended 5.3 cm from its equilibrium position. Calculate the spring of constant of spring?

*Monday, November 14, 2016 by Carmen*

**Physics**

A 5.20 g pellet is shot horizontally from a BB gun at a speed of 29.1 m/s into a 20.8 g wooden block. The wooden block is attached to a spring and lies on a frictionless table. If the collision is inelastic and the spring constant k = 22.0 N/m, what is the maximum compression ...

*Monday, November 14, 2016 by Shane*

**university physics**

two suitcases are on a 7.89 m high ramp to passengers waiting in a baggage terminal. The top suitcase is released from rest, and it slides down the ramp and hits the second suitcase. If the suitcase at the top has a mass of 16.6 kg and the other suitcase has a mass of 33.2 kg...

*Monday, November 14, 2016 by jenna*

**Physics**

A 1340-kg car traveling east at 13.6 m/s (20 mi/h) has a head-on collision with a 1930-kg car traveling west at 20.5 m/s (30 mi/h). If the collision time is 0.10 s, what is the force needed to restrain a 68-kg person in the smaller car? In the larger car? I understand how to ...

*Monday, November 14, 2016 by JJ*

**Physics**

A person makes a quantity of iced tea by mixing 668 g of hot tea (essentially water) with an equal mass of ice at its melting point. If the initial hot tea is at a temperature of 86∘C, what are the (a) final temperature of the ice tea (in ∘C) and (b) mass of the remaining ...

*Monday, November 14, 2016 by Gabriel*

**Physics**

In a calorimetry experiment, an object of mass M= 9.2 kg falls through a height of 35.5 m and, by means of a mechanical linkage, rotates a paddle wheel that stirs m= 0.92 kg of water. The water is initially at 20∘C. What is the maximum possible temperature rise of the water...

*Monday, November 14, 2016 by Gabriel*

**Physics**

If you reduce the distance between two point charges to one third of the original distance, the electromagnetic force changes by a factor of:

*Monday, November 14, 2016 by Maria*

**Physics**

A sign weighing 500N is suspended at the end of a uniform 300N beam 5m in length, as shown. The beam is attatched to the wall with a hinge, and its other end is supported by a wire. What is the tension in the wire if it makes an an angle of 30o with the beam? Help please. Use ...

*Monday, November 14, 2016 by Anonymous*

**Physics**

A man stands on a freely rotating platform, as shown, holding an exercise dumbbell in each hand. With outstretched arms, his angular speed is 1.5 rad/s. After he has pulled his arms in, as shown, his angular speed is 5 rad/s. What is the ratio of his final rotational KE to his...

*Monday, November 14, 2016 by Anonymous*

**Physics**

At the centre of a circular ice rink, a 67.0 kg ice skater moving 2.00 m/s north hits and grabs onto a 41.0 kg ice skater who had been traveling west at 4.30 m/s. If the skaters hold onto each other and the rink has a 42.0 m diameter, what is the amount of time for the skaters...

*Monday, November 14, 2016 by Can you do this ?*

**Physics**

A 1340-kg car traveling east at 13.6 m/s (20 mi/h) has a head-on collision with a 1930-kg car traveling west at 20.5 m/s (30 mi/h). If the collision time is 0.10 s, what is the force needed to restrain a 68-kg person in the smaller car? In the larger car?

*Monday, November 14, 2016 by Batman*

**physics**

A basketball explodes into three separate pieces. Two pieces of equal mass shoot off at 20.3 m/s, one travelling to the south and one to the west, perpendicular to each other. The third piece has a mass 4 times the size of one of the other pieces. What is the speed of the ...

*Monday, November 14, 2016 by Help please!!!*