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March 25, 2017

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Homework Help: Science: Physics

Recent Homework Questions About Physics

physics
A 64.2-kg skateboarder starts out with a speed of 2.21 m/s. He does 98.0 J of work on himself by pushing with his feet against the ground. In addition, friction does -276 J of work on him. In both cases, the forces doing the work are non-conservative. The final speed of the ...
Thursday, January 12, 2017 by Tyler

Physics
You and another person go to the museum and decide to take a look at an exhibit that has a bike with an attached heating coil/generator. The coil is placed in a tank of water at 20 deg C. Peddling makes the coil increase the energy of the water. The goal is to make the water ...
Thursday, January 12, 2017 by Anonymous

physics
What mass of ice at -14°C will be needed to cool 200cm³ of an orange drink(essentially water) from 25°C to 10°C?
Thursday, January 12, 2017 by ayo

Physics
pressure of a fluid. calculate the a.) absolute pressure b.) gauge pressure at an ocean depth of 1000m. Assume the density of a sea water is 1024 kg cubic meter and that the air above exerts a pressure of 101.3kPa
Thursday, January 12, 2017 by Gen

physics
A simple U tube contains mrecury. When 13.6cm of water is poured in one arm caculate the rise of mercury in the other arm
Thursday, January 12, 2017 by favour

physics
A man is standing on a platform that is connected to a pulley arrangement, as the drawing shows. By pulling upward on the rope with a force   the man can raise the platform and himself. The total mass of the man plus the platform is 121 kg. What pulling force should the man ...
Wednesday, January 11, 2017 by Cameron

physics
Force F1 acts on a particle and does work W1. Force F2 acts simultaneously on the particle and does work W2. The speed of the particle does not change. Which one of the following must be true? W1 is zero, and W2 is positive W1 = - W2 W1 is positive, and W2 is positive W1 is ...
Wednesday, January 11, 2017 by Cameron

physics
In which one of the following circumstances does the principle of conservation of mechanical energy apply, even though a nonconservative force acts on the moving object? The nonconservative force has a component that points opposite to the displacement of the object. The ...
Wednesday, January 11, 2017 by Cameron

physics
A 64.2-kg skateboarder starts out with a speed of 2.21 m/s. He does 98.0 J of work on himself by pushing with his feet against the ground. In addition, friction does -276 J of work on him. In both cases, the forces doing the work are non-conservative. The final speed of the ...
Wednesday, January 11, 2017 by Cameron

College Physics
A 0.697-kg basketball is dropped out of a window that is 6.98 m above the ground. The ball is caught by a person whose hands are 1.73 m above the ground. (a) How much work is done on the ball by its weight? What is the gravitational potential energy of the basketball, relative...
Wednesday, January 11, 2017 by Cameron

physics
Juggles the clown stands on one end of a teeter-totter at rest on the ground. Bangles the clown jumps off a platform 2.5 m above the ground and lands on the other end of the teeter-totter, launching Juggles into the air. Juggles rises to a height of 3.7 m above the ground, at ...
Wednesday, January 11, 2017 by Cameron

physics
A 89.7-kg skier rides a 3040-m-long lift to the top of a mountain. The lift makes an angle of 14.3 ° with the horizontal. What is the change in the skier's gravitational potential energy?
Wednesday, January 11, 2017 by Cameron

Physics
A 400g soccer ball is moving through the air at 3.57m/s [64.8°W of N] horizontally at the top of its flight. If at that instant, the soccer ball is struck by a 450g crocket ball moving at 5.46m/s [N], and the soccer ball flies off at 4.28m/s[22.4°W of N]. What will be the ...
Wednesday, January 11, 2017 by Guillaume

Physics
An object is 10 mters long and has a weight of 125N. The weight of the object is determined by the expression, 250N= a10m+B kg/m. What are the units of a and B
Wednesday, January 11, 2017 by Anonymous

Physics
It takes 226 kJ of work to accelerate a car from 23.3 m/s to 28.3 m/s. What is the car's mass?
Wednesday, January 11, 2017 by Cameron

physics
A fisherman is fishing from a bridge and is using a "43.0-N test line." In other words, the line will sustain a maximum force of 43.0 N without breaking. What is the weight of the heaviest fish that can be pulled up vertically, when the line is reeled in (a) at constant ...
Wednesday, January 11, 2017 by Cameron

physics
A 1450-kg submarine rises straight up towards the surface. Seawater exerts both an upward buoyant force of 16890 N on the submarine, as well as a downward resistive force of 1010 N. What is the submarine's acceleration?
Wednesday, January 11, 2017 by Tyler

Physics
What is the period of a wave that travels through a spring at 2.5 m/s and has a wavelength of 1.3 meters?
Wednesday, January 11, 2017 by Anonymous

physics
A worker stands still on a roof sloped at an angle of 43° above the horizontal. He is prevented from slipping by a static frictional force of 520 N. Find the mass of the worker.
Wednesday, January 11, 2017 by Tyler

physics
Part (a) of the drawing shows a bucket of water suspended from the pulley of a well; the tension in the rope is 56.0 N. Part (b) shows the same bucket of water being pulled up from the well at a constant velocity. What is the tension in the rope in part (b)?
Wednesday, January 11, 2017 by Tyler

physics
The drawing shows a wire tooth brace used by orthodontists. The top-most tooth is protruding slightly, and the tension in the wire exerts two forces,  and , on this tooth in order to bring it back into alignment. If the forces have the same magnitude of 24.3 N, what is ...
Wednesday, January 11, 2017 by Tyler

physics
Three forces act on a moving object. One force has a magnitude of 76.5 N and is directed due north. Another has a magnitude of 46.3 N and is directed due west. What must be (a) the magnitude and (b) the direction of the third force, such that the object continues to move ...
Wednesday, January 11, 2017 by Tyler

College Physics
The space probe Deep Space 1 was launched on October 24, 1998. Its mass was 474 kg. The goal of the mission was to test a new kind of engine called an ion propulsion drive. This engine generated only a weak thrust, but it could do so over long periods of time with the ...
Wednesday, January 11, 2017 by Tyler

Physics
A Man Of Mass 80kg Carry A Load Of Bricks Of 20kg Up A Vertical Of Length 6m Calculate The Workdone
Wednesday, January 11, 2017 by Elijah

Physics
A Man Of Mass 80kg Carry A Load Of Bricks Of 20kg Up A Vertical Of Length 6m Calculate The Workdone.
Wednesday, January 11, 2017 by Elijah

Physics
A ball is allowed to fall freely from certain heightn. What distance it covers in 1st second?
Wednesday, January 11, 2017 by Ali

physics
A body of mass 10 kg is attached to a wire 30 cm long. Area of cross section of the wire is 10 raise to power -6 metre square. It's breaking stress is 4.8×10 raise to power 7 N/metre square. Find maximum angular velocity with which it can be rotated in the horizontal circle?
Wednesday, January 11, 2017 by bhai

Physics
Two blocks at rest on a frictionless inclined surface with mass of 3kg on a side inclined at 42° to the horizontal and mass 4.8kg a side inclined at 30° to the horizonal. if the two bodies are attached together by an extensible string passed through a pulley. A) Determine ...
Wednesday, January 11, 2017 by Dami

Physics
Two forces are applied to a box on a frictionless surface. One force is 40 N [S]. The second force is 70 N [N30ºW]. What is the overall net force? a) 40.6 N [S59.5ºE] b) 110 N c) 40.6 N [N59.5ºW] d) 40.6 N [S30.5ºW]
Wednesday, January 11, 2017 by Jassy

Physics
An electric heater raises the temperature of 120g of water in a thin light vessel through 10K in 2mins, when placed in 70g of water contained in a metal vessel of mass 0.55kg the temperature rises through 9K in the same time. Calculate from the above: a)the heat supplied in ...
Tuesday, January 10, 2017 by Busola

Physics
what mass of ice at -14'c will be needed to cool 200cm3 of an orange drink (essentially water) from 25'c to 10'c! (specific latent heat of fusion of ice =336000) (specific heat capacity of ice = 2100) (specific heat capacity of water = 4200)
Tuesday, January 10, 2017 by Busola

Physics
calculate the specific heat capacity of the materials for which the heat supply, mass, and temperature rises are given below: i)25200J, 0.3Kg,20K ii)8000J, 500g, from 20'C to 60'C iii)9450J, 150g, from 15'C to 45'C
Tuesday, January 10, 2017 by Busola

physics
an electric heater raises the temperature of 120g of water in a thin light vessel through 10K in 2mins, when placed in 70g of water contained in a metal vessel of mass 0.55kg the temperature rises through 9K in the same time. Calculate from the above: a)the heat supplied in ...
Tuesday, January 10, 2017 by fiyin

physics
calculate the specific heat capacity of the materials for which the heat supply, mass, and temperature rises are given below: i)25200J, 0.3Kg ii)8000J, 500g, from 20'C to 60'C iii)9450J, 150g, from 15'C to 45'C
Tuesday, January 10, 2017 by fiyin

physics
150g of ice at 0'c is mixed with 300g of water at 50'c. calculate the temperature of a mixture
Tuesday, January 10, 2017 by fiyin

physics
1) what mass of ice at -14'c will be needed to cool 200cm3 of an orange drink (essentially water) from 25'c to 10'c! (specific latent heat of fusion of ice =336000) (specific heat capacity of ice = 2100) (specific heat capacity of water = 4200)
Tuesday, January 10, 2017 by fiyin

Physics
An airplane travelling north at 400 m/s is accelerated due east at a rate of 50m/s^2 for 6 seconds. If the effects of air resistance and gravity are ignored, what is the final speed of the plane? My working: v=vo+at where a=50m/s Vo = 400 m/s t = 6s thus: Vo=400+50(6) =700m/s ...
Tuesday, January 10, 2017 by Anonymous

Physics
Can someone please tell me how to derive this: its supposed to be projectile motion with spring x = Sqrt (dx*g*1/2*m) +(mgh sin2theta) ---------------------------- (1/2)(k)(sin2theta) all i got is r =v^2sin2theta / g x is displacement of elastic plz help
Tuesday, January 10, 2017 by Stacy

physics
Water is flowing in a pipe with a circular cross-section area ,and at all point the water completely fills the pipe.At point 1 ,the cross sectiona are of pipe is 0.070 meter square and the fluid velocity is 3.50 meter per second. a.) what is the fluid speed at point in the ...
Tuesday, January 10, 2017 by cathrena

pure physics
a stone weighs 0.25N in air and o.20N when completely immersed in water. what is the the up thrust on the stone?
Tuesday, January 10, 2017 by Natasha

physics`
which has more momentum: a snail moving at .001m/s or a 2-ton boulder resting on the ground? why?
Tuesday, January 10, 2017 by Anonymous

Physics
The man pushes/pulls with a force of 200N. The child and the slide combo has a mass of 30 kg and coefficient of friction is 0.15. The angle between the slide and the ground is 30 degrees. Find the acceleration of the child and what is the frictional forces opposing his efforts
Tuesday, January 10, 2017 by Thokozanitausi

Physics
Can someone please tell me how to derive this: its supposed to be projectile motion with spring x = Sqrt (dx*g*1/2*m) +(mgh sin2theta) ---------------------------- (1/2)(k)(sin2theta) all i got is r =v^2sin2theta / g x is displacement of elastic plz help
Monday, January 9, 2017 by Stacy

Physics
An impulse of 25 N*s is exerted on a 0.25 kg baseball traveling 40 m/s west. What is the velocity of the baseball after it has been hit?
Monday, January 9, 2017 by Garrett

Physics
A ball with mass m=1kg and speed vo=5m/sec elastically collides with a stationary, identical ball (all resting on a frictionless surface so gravity is irrelevant). A student measures the top ball emerging from the collision at at speed vt=4m/sec at an angle ϴt ≈ 37°. a) ...
Monday, January 9, 2017 by Brian

Physics
A car moving at 60 km/h skids 13 m with locked brakes. How far will the car skid with locked brakes at 180 km/h?
Monday, January 9, 2017 by JESS

Physics
A great white shark of mass m1, coasting through the water in a nearly frictionless way at speed v1 engulfs a tuna of mass m2=0.10 m1 traveling in the same direction at speed v2 swallowing it in one bite. a) What is the speed of the shark after its meal? b) Did the shark gain...
Monday, January 9, 2017 by Tom

Physics
the orbital period of the moon is 27.32 days. The international space station has an orbital period of 90 minutes. What is the mean distance between the center of the earth and the center of the international space station? moons orbital radius: 25,201
Monday, January 9, 2017 by Anonymous

Physics
A bullet of mass m travelling at speed vo in the direction shohwn above strikes a block of mass M and embeds itself in it. The block is sitting on the edge of a frictionless table of height H and is knocked off of the table by the collision. a) What is the speed vb of the ...
Monday, January 9, 2017 by Joe

Physics
A hammer of mass m falls from rest off of a roof and drops a height H onto your head. a) Assuming that the tool is in actual contact with your head for a time △t before it stops and slides off, what is the algebraic expression for the average force it exerts on your skull ...
Monday, January 9, 2017 by Bob

Math, Physics
Calculate Earth's gravitational force on the ISS astronauts while orbiting at an altitude of 401.5 km above Earth’s surface.
Monday, January 9, 2017 by Hooman

physics
A boy lining a railway bridge 49ft. high, sees a train uproaching with uniform speed and attempt to drop a stone down to railway. He releases the stone when engine is 80ft. away from the point below his position and sees the stone hits in the ground just 3 ft. in front of the ...
Monday, January 9, 2017 by Athena

Physics
At what frequency would a capacitor of 2.5 microfarads used in a radio circuit have a reactance of 250 ohms
Monday, January 9, 2017 by Bosola

physics
Only two forces act on an object (mass=3.19 kg), as in the drawing. Find (a) the magnitude and (b) the direction (relative to the x axis) of the acceleration of the object.
Sunday, January 8, 2017 by Tyler

physics
An apple crate with a weight of 225 N accelerates along a frictionless surface as the crate is pulled with a force of 14.5 N as shown in the drawing. What is the horizontal acceleration of the crate?
Sunday, January 8, 2017 by Tyler

physics
A mountain climber, in the process of crossing between two cliffs by a rope, pauses to rest. She weighs 520 N. As the drawing shows, she is closer to the left cliff than to the right cliff, with the result that the tensions in the left and right sides of the rope are not the ...
Sunday, January 8, 2017 by Tyler

physics
During a storm, a tree limb breaks off and comes to rest across a barbed wire fence at a point that is not in the middle between two fence posts. The limb exerts a downward force of 253 N on the wire. The left section of the wire makes an angle of 15.4° relative to the ...
Sunday, January 8, 2017 by Kyle

physics
One block rests upon a horizontal surface. A second identical block rests upon the first one. The coefficient of static friction between the blocks is the same as the coefficient of static friction between the lower block and the horizontal surface. A horizontal force is ...
Sunday, January 8, 2017 by Kyle

physics
Traveling at a speed of 18.0 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.580. What is the speed of the automobile after 1.44 s have elapsed? Ignore the ...
Sunday, January 8, 2017 by Kyle

physics
A person pushes on a 55-kg refrigerator with a horizontal force of -250 N; the minus sign indicates that the force points in the -x direction. The coefficient of static friction is 0.56. (a) If the refrigerator does not move, what are the magnitude and direction of the ...
Sunday, January 8, 2017 by Kyle

physics
A car is traveling up a hill that is inclined at an angle θ above the horizontal. Determine the ratio of the magnitude of the normal force to the weight of the car when (a)  θ = 17o and (b)  θ = 30o
Sunday, January 8, 2017 by Kyle

physics
when an apple falls from a tree, and strikes the ground without bouncing, what happens to its momentum?
Sunday, January 8, 2017 by Anonymous

Physics
A 100 grams mass of a substance has a volume of 150 centmetre cube.Calculate the relative density of the substanc. [density of water pw=1.0gcm^-3]
Sunday, January 8, 2017 by Angela

Physics
An alloy of iron and silver has a total mass of 30 grams and a volume of 20.4cm^-3.Calculate the mass of iron only and the volume of silver only. [Density of iron=1.62gcm^3 and density of silver=0.9gcm^3]
Sunday, January 8, 2017 by Juliet

Physics
A piece of metal of volume 250 centimetre cube floats in water when 85 percent of its volume is under water.Calculate the upthrust on the metal. [pw=1.0gcm^-3]
Sunday, January 8, 2017 by George

Physics
An empty bottle weighs 20 grams and 60 grams when filled completely with water.What would the bottle weigh when filled completely with mercury. [pw=1.0gcm^-3,pm=1.6gcm^-3]
Sunday, January 8, 2017 by Daniel

physics
when temperature increases from t to # t and the moment of inertia is increase from I to #I. the coefficent of linear expansion is alpha .THE RATIO OF #I\I IS
Sunday, January 8, 2017 by Anonymous

Physics
A ball thrown with a speed of 100m/s attains a height of 150m (take g=9.8 per second square). Calculate: 1. Time of flight 2. Angle of projection 3. Range
Sunday, January 8, 2017 by Mk hamman

Physics
What is specific heat
Sunday, January 8, 2017 by Kritika

Science(physics)
A boy while driving to his school covers at the average speed of 15km/h.On his return trip along the same route, covers at the average speed of 25km/h due to less traffic.What is the average speed for the whole trip
Sunday, January 8, 2017 by Henry

Physics
The engineer of a passenger train moving at 29.0 m/s sees a freight train 360.m ahead on the track moving at 6.00 m/s. The engineer takes 0.400 seconds to react, and then applies the brakes. At what rate must the passenger train then decelerate in order to avoid a collision? ...
Saturday, January 7, 2017 by Bob

Physics
A 55kg person pushes on the floor with 800 N of force for 0.25 seconds. How high do they jump off the ground? I know how to find acceleration but I can't find distance.
Saturday, January 7, 2017 by Bob

Physics
An alloy of iron and silver has a total mass of 30 grams and a volume of 20.4 centimetre cube Calculate the mass of iron only and the volume silver only Please help
Saturday, January 7, 2017 by Peter

Physics
A piece of metal of volume 250 cetimetre cube floats in water when 85 percent of it's volume is under water.Calculate the upthrust on the metal. 250*85=21250
Saturday, January 7, 2017 by Jack

Physics
An empty bottle weighs 20g and 60g when filled completely with water.What will it weigh when filled completely with mercury? 20÷60=0.3
Saturday, January 7, 2017 by James

Physics
A student eats a dinner containing 8.0x10 raised to power 6j of energy. He wishes to do an equivalent amount of work in a nearby gym by lifting a 60kg object. How many times must he raise the object to expand this much energy? Assume that he raises it a distance of 2.0m each ...
Saturday, January 7, 2017 by Reigna

physics
a runner in marathon passes the 5 mile mark at 1 o'clock and the 20 mile mark at 3 o'clock .what is the runners average speed during this time period?
Saturday, January 7, 2017 by mandy Schwarzenegger

physics
A passengers jet flies from one airport to another 1,200 miles away in 2.5h .Find its average speed.
Saturday, January 7, 2017 by mandy Schwarzenegger

physics
How far does a car going 25 m/s travel in 5s ? How far would a jet going 250 m/s travel in 5s?
Saturday, January 7, 2017 by mandy Schwarzenegger

Physics
Find the specific heat of an unknown metal given this data: Mass of the metal = 120 g Temp of the metal = 220 degrees Mass of the water = 30 g Initial Temp of the water = 20 degrees Final Temp of the water = 85.6 degrees Specific Heat of the water = 4.186 J/gram C I get 0.51 J...
Friday, January 6, 2017 by Anonymous

physics
ifv=(3i+4j+5k)m/s is the instantaneous velocity of a body mass 1.50kg calculate its K.E
Friday, January 6, 2017 by krushidhar

physics
An ostrich with a mass of 139 kg is running to the right with a velocity of 17 m/s. Find the momentum of the ostrich. Answer in units of kg · m/s.
Thursday, January 5, 2017 by iz

physics
A car is traveling up a hill that is inclined at an angle θ above the horizontal. Determine the ratio of the magnitude of the normal force to the weight of the car when (a)  θ = 17o and (b)  θ = 30o.
Thursday, January 5, 2017 by Kyle

Physics
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Thursday, January 5, 2017 by :(

Physics
A 70.0-kg astronaut pushes to the left on a spacecraft with a force   in "gravity-free" space. The spacecraft has a total mass of 1.0 × 104 kg. During the push, the astronaut accelerates to the right with an acceleration of 0.36 m/s2. Determine the magnitude of the ...
Thursday, January 5, 2017 by Kyle

physics
When a parachute opens, the air exerts a large drag force on it. This upward force is initially greater than the weight of the sky diver and, thus, slows him down. Suppose the weight of the sky diver is 869 N and the drag force has a magnitude of 1096 N. The mass of the ...
Thursday, January 5, 2017 by Thomas

physics
Two skaters, a man and a woman, are standing on ice. Neglect any friction between the skate blades and the ice. The mass of the man is 84 kg, and the mass of the woman is 49 kg. The woman pushes on the man with a force of 58 N due east. Determine the acceleration (...
Thursday, January 5, 2017 by Thomas

physics
In a quarter-mile drag race, two cars start simultaneously from rest, and each accelerates at a constant rate until it either reaches its maximum speed or crosses the finish line. Car A has an acceleration of 11.0 m/s2 and a maximum speed of 110 m/s. Car B has an acceleration ...
Thursday, January 5, 2017 by Thomas

physics
An electron is a subatomic particle (m = 9.11 x 10-31 kg) that is subject to electric forces. An electron moving in the +x direction accelerates from an initial velocity of +7.62 x 105 m/s to a final velocity of 2.56 x 106 m/s while traveling a distance of 0.0778 m. The ...
Thursday, January 5, 2017 by Thomas

physics
Can someone please help me? I am having a really hard time with physics. This is not a test question. It is a practice problem from a review website I am supposed to use, but I am having a really hard time. Can someone at least help me to begin setting up the problem? I would ...
Thursday, January 5, 2017 by anonymous

College Physics
Two forces  and  are applied to an object whose mass is 5.75 kg. The larger force is . When both forces point due east, the object's acceleration has a magnitude of 0.979 m/s2. However, when  points due east and  points due west, the acceleration is 0.639 m/s2, ...
Thursday, January 5, 2017 by Thomas

physics
a ball is thrown Vatican upward with a velocity of 20.0m/s. a) what is the retardation of the ball? b) what distance does it travel before its comes to rest movementally at the top of its motion? c) what is the time taken for the ball to reach its highest point? d) what is the...
Thursday, January 5, 2017 by comfort

physics (mechanics)
the potential energy of a system of two particle separated by a distance r is given by u(r) = A/r , where A is constant . find the radial force Fr that each particle exerts on the other
Thursday, January 5, 2017 by asnke

College Physics
An airplane has a mass of 3.19 × 104 kg and takes off under the influence of a constant net force of 1.56 × 104 N. What is the net force that acts on the plane's 82.1-kg pilot?
Wednesday, January 4, 2017 by Micah

Physics
Draw a block and tackle system of pulleys with a velocity ratio of 5.A block and tackle with a velocity ratio of 5 is used to raise a mass of 25kg through a vertical distanceof 40cm at a steady rate. If the efforts is equal to 60N, determine a)d distance moved by the effort b)...
Wednesday, January 4, 2017 by Nelson

Physics
3. What happens to the speed of ocean waves as they come close to shore? How can this be explained from what you've learned so far? (this the teacher means what do the lessons have to do with this question) 4. Sound travels faster through wood than through air. Sound also ...
Wednesday, January 4, 2017 by Manie

physics
A small tiny nail may Pierce an inflated Tyre and remain there without pressure reduction.explain
Wednesday, January 4, 2017 by Anonymous

physics
A man holds a child on shoulders while watching a football match. How much work has he done if the game last for 2 hours
Wednesday, January 4, 2017 by paul

Physics
Hello, can someone please check my answers and tell me if they are correct? 1. A laser produces a pulse of light with a speed of 300000000m/s in vacuum in a time 1.70x10^-15s. a) what is the length of the pulse? b) The pulse travels into a piece of glass in which it's lenghth ...
Tuesday, January 3, 2017 by Jon - Please check my answers

Physics, math, algebra
How long will it take a sled to reach the bottom of a hill, if it accelerates at 5.60m/s^2 and has a final velocity at the bottom of the hill of 42.3km/h?
Tuesday, January 3, 2017 by Anonymous

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