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July 1, 2016

Homework Help: Science: Physics

Recent Homework Questions About Physics

Physics
The distance between two telephone poles is 42 m. When a 1.44 kg bird lands on the telephone wire midway between the poles, the wire sags 0.139 m. The acceleration of gravity is 9.8 m/s2 . How much tension in the wire does the bird produce? Ignore the weight of the wire. ...
Monday, October 26, 2015 by Jake

physics
A truck accelerates uniformly from rest to 21.5m/s in 5.7sec along a level stretch of road. Determine the average power required to accelerate the truck for the following values of the weight (ignore friction) a) 1.00x10^4 N b) 1.45x10^4 N I used constant acceleration equation...
Monday, October 26, 2015 by Christine

Physics
A ball of mass 0.3kg moving at a velocity 20/s is suddenly hit by a force of 5 Newton for a time of 0.03 seconds. Find its new velocity
Monday, October 26, 2015 by Habeeb

Physics
You are installing a new art piece after buying it from a second hand store. You are installing the piece on the wall at an incline. Suppose there are three forces when the piece is installed and each tension is about 77 N, what is the force of gravity acting on the art piece?
Monday, October 26, 2015 by Jake

Physics
A rock is thrown horizontally off of a cliff. It starts with a velocity of 4.2 m/s and the cliff is 68.2 m high. How long does the rock fall? I got 3.7 seconds but I do not know if it is right. (Help on these two) How far out from the bottom of the cliff does the rock fall? ...
Monday, October 26, 2015 by Carlos

Physics
A rocket is launched at an angle of è = 48° above the horizontal with an initial speed vi = 62 m/s, as shown below. It moves for 25 s along its initial line of motion wth an acceleration of 25.6 m/s2. At this time, its engines fail and the rocket proceeds to move as...
Monday, October 26, 2015 by Anonymous

physics
A sphere of mass 78 kg is attached to one end of a rope as shown in the figure below. It is found that the rope does an amount of work W = 3550 J in pulling the sphere upward through a distance 4.6 m. Find the work done by the force of gravity on the sphere. My work W= -78 * 9...
Monday, October 26, 2015 by Dan

Physics
A place kicker must kick a football from a point 31.2 m from a goal. As a result of the kick, the ball must clear the crossbar, which is 3.05 m high. When kicked the ball leaves the ground with a speed of 21.3 m/s at an angle of 53° to the horizontal. By how much does the ...
Monday, October 26, 2015 by Anonymous

Physics
A place kicker must kick a football from a point 31.2 m from a goal. As a result of the kick, the ball must clear the crossbar, which is 3.05 m high. When kicked the ball leaves the ground with a speed of 21.3 m/s at an angle of 53° to the horizontal. By how much does the ...
Monday, October 26, 2015 by Anon

physics
how much energy is required to move a 1000kg object from the Earth's surface to an altitude twice Earth's radius?
Monday, October 26, 2015 by ling

science/physics
just trying to find out what temperature the water in my celcius heating system needs to be to achieve an air tempature of 68 degrees ferinheidt
Monday, October 26, 2015 by Anna

Physics
How much torque is required to accelerate a uniform sphere of mass 10,000.0 kg and radius 2.5 meters from rest to an angular velocity of 60 rpm in a time of 90 seconds?
Sunday, October 25, 2015 by Dallas

Physics I
What is the torque produced by a force of 40N j applied at the point 2 m i - 5 m j + 3 m k?
Sunday, October 25, 2015 by Tim

physics
The motion of a human body through space can be modeled as the motion of a particle at the body's center of mass. The components of the position of an athlete's center of mass from the beginning to the end of a certain jump are described by the following two equations...
Sunday, October 25, 2015 by Spice

physics
A dive bomber has a velocity of 290 m/s at an angle θ below the horizontal. When the altitude of the aircraft is 2.15 km, it releases a bomb, which subsequently hits a target on the ground. The magnitude of the displacement from the point of release of the bomb to the ...
Sunday, October 25, 2015 by Spice

physics
how do you plot T2 2.14, 2.10, 2.08, 2.03, 2,20 and 2.30 and length .445, .54m, .497m, .50m, .53m and .555m on a graph and how do you find the gradient
Sunday, October 25, 2015 by jb

Physics
Skier A of mass 71kg slides down a slope and makes a completely inelastic collision with Skier B, who is stationary, and has a mass of 55kg.Immediately after the collision both skiers have a speed of 5.8m/s. a)Find the speed of skier A immediately before the collision. (I got ...
Sunday, October 25, 2015 by Christine

physics
A 0.400-kg ice puck, moving east with a speed of 5.38 m/s , has a head-on collision with a 0.950-kg puck initially at rest. Assume that the collision is perfectly elastic. What is the speed of the 0.400-kg puck after the collision?
Sunday, October 25, 2015 by arshi

Physics
A motorcycle rider plans to make a jump off a ramp. If he leaves the ramp with a speed of 38.0m/s and has a speed of 36.3m/s at the top of his trajectory, determine his max height above the end of the ramp. Ignore friction and air resistance. i got 6.45m but i really don't...
Sunday, October 25, 2015 by Christine

physics
A Knight of the Round Table fires off a vat of burning pitch from his catapult at 17.4 m/s, at 33 ◦ above the horizontal. The acceleration of gravity is 9.8 m/s 2 . How long is it in the air? Answer in units of s. What is the horizontal component of the velocity? Answer ...
Sunday, October 25, 2015 by Issa

Physics
W have three air carts (labeled #1, #2, and #3) on an air track. The carts are equipped with spring bumpers so that all collisions are elastic. The masses of the carts are m1 = 5m, m2 = 2m, and m3 = m. Initially, cart #1 is given a velocity to the right of magnitude v0 and the...
Sunday, October 25, 2015 by Whitney

physics
Derive a general equation for the time of flight of the banana en route to the monkey in terms of only the velocity, distance, and height hint: if you are doing everything right, there should be a lot of cancellations resulting in a relatively simple solution Okay, this is ...
Sunday, October 25, 2015 by Spice

Physics
A car of mass 1300 kg is driving along a road at speed of 28m/s. As it approaches some traffic lights, the lights change to red and the driver applies his brakes causing the car to skid. The frictional force between the skidding tyres and the road is 0.8 of the weight of the ...
Sunday, October 25, 2015 by Sean

physics
A car travels with uniform velocity of 30m for 5 secs and then comes to rest in the next 10sec with the aid of a diagram calculate the deceleration of the car
Sunday, October 25, 2015 by Beatrice Esther

physics
A mass is pushed over a surface by a 19 N force that acts somewhat downward at an angle of θ = 45° to the horizontal as shown in the figure below. The mass is 3.0 kg and the coefficient of friction between the mass and surface is 0.25. (a)What is the magnitude of the ...
Sunday, October 25, 2015 by Anonymous

Physics
200 g of ice at 0ºC put in 500 g of water at 20C. The system is in a container with negligible heat capacity and which is isolated from surroundings. a)What will be the final temperature (at equilibrium) of the system? b)How much ice is melting?
Sunday, October 25, 2015 by Zhenya

Physics - Please Check Answers ASAP
Please check these over and see if any are incorrect? 1. The units of speed are: a) m/s ---> my answer b) m/s^2 and direction c) N d) m/s and direction 2. Which of Newton's Laws says you cannot touch anything without being touched? a) 4th b) 2nd c) 1st d) 3rd ---> my...
Sunday, October 25, 2015 by Catherine

Physics - Check Answers ASAP
Could someone please check over my answers? I'm not very good at physics, and therefore am not sure if I got all of them correct. 1. A skier of mass 70.0 kg is pulled up a slope by a motor-driven cable. How much work is required to pull the skier 60.0 m up a 350 slope (...
Sunday, October 25, 2015 by Alysse

Physics
Water emerges vertically from a hose at ground level and rises to a height of 3.2 m. (a) At what speed does the water emerge from the nozzle? (b) How long is a given drop in the air?
Sunday, October 25, 2015 by Anonymous

Physics
2 students ride a slingshot. The slingshot catapults 2 students at a time vertically 365 feet in an amount of time proportional to their mass. If 2 small students, each with a mass of 150 pounds were to ride, what would be their respective accelerations, converted to miles per...
Sunday, October 25, 2015 by Jill

Urgent physics help
A plane flies 230 mph at 60 degrees north of west for 2.5 hours how far did the plane travel? how far west did it go? how far north did it go? how fast did it go west?
Sunday, October 25, 2015 by Anonymous

Quick Physics check
Add together these vectors: V1= 60 Newtons at 45 degrees N of W; V2= 5Newtons at 30 degrees S of E Is it 61.49N@40.50 n of w?
Sunday, October 25, 2015 by Anonymous

physics
Derive a general equation for the time of flight of the banana en route to the monkey in terms of only the velocity, distance, and height hint: if you are doing everything right, there should be a lot of cancellations resulting in a relatively simple solution Okay, this is ...
Sunday, October 25, 2015 by Spice

Physics
A car of mass 1300 kg is driving along a road at speed of 28m/s. As it approaches some traffic lights, the lights change to red and the driver applies his brakes causing the car to skid. The frictional force between the skidding tyres and the road is 0.8 of the weight of the ...
Sunday, October 25, 2015 by Sean

Physics
A ball is dropped from a height of 20 meter and rebounded with a velocity which is 3 by 4 of the velocity with which it hits the ground. What is time interval between the first and second bounces?
Sunday, October 25, 2015 by Anonymous

physics
a solar panel is 12% efficient at converting sunlight into electrical energy.on average the sunlight that strikes the earth's surface has an intensity of 250 w/m^2 which of the following is the best estimate for the area of the solar panel needed to provide 1.2Kw of energy...
Sunday, October 25, 2015 by iffat

Physics
what is the equation describing the motion of mass on the end of a spring which is streached 8.8 cm from equlibrium and then released from rest and whose period is .66 s ? what will be its displacement after 1.8 s
Sunday, October 25, 2015 by Susmitha

physics
4. A mover wants to push a box down a hall. The mover applies an ‘action’ force on the box (the push). According to Newton’s 3rd law, there is a ‘reaction’ force applied in the opposite direction. The larger the action force applied by the mover, the ...
Saturday, October 24, 2015 by XOXOX

Physics
How does an electric motor work, linking to the theory of electromagnetism? I have already identified a few laws: -Ohms -Faraday's
Saturday, October 24, 2015 by Elisa

Physics
What average power would a 1.20 multiply.gif 103-kg speedboat need to go from rest to 18.0 m/s in 4.79 s, assuming the water exerts a constant drag force of magnitude fd = 5.34 multiply.gif 102 N and the acceleration is constant?
Saturday, October 24, 2015 by Johnny

physics
A baseball is thrown at an angle of 21 ◦ relative to the ground at a speed of 22 . 7 m / s. The ball is caught 35 . 1474 m from the thrower. The acceleration due to gravity is 9 . 81 m / s 2 . How long is it in the air?
Saturday, October 24, 2015 by Anonymous

Physics
Consider a road over a hill where the top is shaped like a circular bump. This circular arc has its center in the hill below. As a 1200 kg car rounds the top of a hill at a speed of 20.0 m/s, it very breifly loses contact with the pavement. What is the radius of this circular ...
Saturday, October 24, 2015 by S

Physics
Why would a graph of force vs position not be uniform??
Saturday, October 24, 2015 by Faith

physics
An 18 kg curling stone sliding on a sheet of ice hits a rough patch on the ice where the coefficient of friction increases from 0.13 to 0.28. It enters this rough patch with a speed of 2.2 m/s and leaves with a speed of 1.4 m/s. How long is the rough patch? What are we suppose...
Saturday, October 24, 2015 by XOXOX

Physics (Biomechanics)
Scott is rolling down a 30° slope on his skateboard.The total mass of Scott and the skateboard is 75 kg. The rolling friction between the skateboard wheels and the concrete is 9 N acting backward against the skateboard. The drag force due to air resistance is 11 N acting ...
Saturday, October 24, 2015 by Deucalion

Physics
A car is traveling North. In which direction are the wheels turning. This is under the torque chapter
Saturday, October 24, 2015 by daniel

physics
Derive a general equation for the time of flight of the banana en route to the monkey in terms of only the velocity, distance, and height (as labelled in the graph above). hint: if you are doing everything right, there should be a lot of cancellations resulting in a relatively...
Saturday, October 24, 2015 by LoveShack

physics
Calvin is pulling Hobbes on his sled with a force of 45 N [30 degrees above the ground]. The mass of Hobbes and the sled is 18 kg and the coefficient of friction between the sled and the ground is 0.25. What would the net force be in this case? 0?
Saturday, October 24, 2015 by XOXOX

Physics
A rocket blasts off from rest and attains a speed of 42.3 m/s in 13.8 s. An astronaut has a mass of 70.2 kg. What is the astronaut's apparent weight during takeoff?
Saturday, October 24, 2015 by Jess

Physics
As shown in the figure below, we have three air carts (labeled #1, #2, and #3) on an air track. The carts are equipped with spring bumpers so that all collisions are elastic. The masses of the carts are m1 = 5m, m2 = 2m, and m3 = m. Initially, cart #1 is given a velocity to ...
Saturday, October 24, 2015 by Anonymous

Physics
A car is traveling North. In which direction are the wheels turning. This is under the torque chapter
Saturday, October 24, 2015 by daniel

AP Physics
A ball is kicked 30º above the horizontal with an initial velocity of 20m/s. A fence 2.3 meters high is located 32 meters away. a. How long does it take to reach the fence? b. Does it goes over the fence? Does it hit the ground before? By how much? I believe I have to ...
Saturday, October 24, 2015 by Jessica

physics
Calvin is pulling Hobbes on his sled with a force of 45 N [30o above the ground]. The mass of Hobbes and the sled is 18 kg and the coefficient of friction between the sled and the ground is 0.25. Determine a) the net force in the vertical. in this case is the net force going ...
Saturday, October 24, 2015 by Natasha

physics
projectile l (height) l (canon's velocity>) /--------------------l (distance) I did a mock of the picture provided. Here it is showing a cannon shooting a banana to the monkey on top of a tree. It gives you no numbers. Question: Derive a general equation for the time of...
Saturday, October 24, 2015 by LoveShack

Physics
A puck of mass 0.03 kg slides across rough ice, experiencing a frictional force of 0.2 N. If it was moving at 36 m/s when I hit the ice patch, A) How long did it take to stop? B) What was the length of the ice patch? I know I have initial velocity, mass and final velocity of ...
Saturday, October 24, 2015 by Cali

physics
A body of mass 0.4kg moving with constant speed of 10m/s to north is subjected to a constant force of 8 N directed towards the south for 30s. Take the instant the force is applied to be t=0, the position of the body at that time to be x=0 and t =-5s and t=-25s
Saturday, October 24, 2015 by jeet mali

PHYSICS
An automobile accident causes both the driver and passenger front airbags to deploy. a. If the vehicle travelled at a speed of 88.6 km/h is now at rest, find the change in momentum for both the 68.4 kg adult driver and the 34.2 kg child passenger. b. The adult took 0.564 s and...
Saturday, October 24, 2015 by CHARLES

physics
An astronaut on the Moon throws a stone from the top of a cliff. The stone hits the ground below 21.0 seconds later. The acceleration due to gravity on the moon is 1.6 ms–2. what is the initial vertical velocity?
Saturday, October 24, 2015 by mark

Physics!!!!222
2. A 75.0-kg painter climbs a ladder that is 2.75 m long leaning against a vertical wall. The ladder makes a 30.0° angle with the wall. (a) How much work does is done by gravity on the painter? (b) Does the answer to part (a) depend on whether the painter climbs at ...
Saturday, October 24, 2015 by Anonymous

Physics!!!!
3. You push your physics book 1.50 m along a horizontal table- top with a horizontal push of 2.40 N while the opposing force of friction is 0.600 N. How much work does each of the following forces do on the book: (a) your 2.40-N push, (b) the friction force, (c) the normal ...
Saturday, October 24, 2015 by Anonymous

Physics
2. A 75.0-kg painter climbs a ladder that is 2.75 m long leaning against a vertical wall. The ladder makes a 30.0° angle with the wall. (a) How much work does is done by gravity on the painter? (b) Does the answer to part (a) depend on whether the painter climbs at ...
Saturday, October 24, 2015 by Anonymous

Physics
1. A student librarian picks up a 2.2 kg book from the floor to a height of 1.0 m. He carries the book 5.3 m to the shelves and places the book on a shelf that is 0.65 m above the floor. How much work does he do on the book?
Saturday, October 24, 2015 by Anonymous

Physics
what is the total displacement of a runner which finish the 1-km race in just 10 seconds
Saturday, October 24, 2015 by Lester

physics
You have two cylindrical solenoids, one inside the other, with the two cylinders concentric. The outer solenoid has length ℓouter = 400 mm, radius R outer = 50 mm, and N outer = 2000 windings. The inner solenoid has length ℓinner = 40 mm, radius R inner = 20 mm, ...
Saturday, October 24, 2015 by alexw

physics
1. Calvin is pulling Hobbes on his sled with a force of 45 N [30o above the ground]. The mass of Hobbes and the sled is 18 kg and the coefficient of friction between the sled and the ground is 0.25. Determine a) the net force in the vertical. in this case is the net force ...
Friday, October 23, 2015 by Natasha

Physics
A railroad freight car with a mass of 50,000 kg is rolling along a level track at 0.30 m/s. A rope trails behind it. If the maximum force you could apply to stop the cart is 250 N, what is the shortest amount of time (measured in seconds) it would take for you to bring it to ...
Friday, October 23, 2015 by Alice

Physics
A spring that has a spring constant of 150 N/m is oriented vertically with one end on the ground. (a) What distance does the spring compress when a 4-kg object is placed on its upper end? in m. (b) By how much does the potential energy of the spring increase during the ...
Friday, October 23, 2015 by Alyssa

Please Help with Physics ASAP!!
Okay, so I totally don't understand what to do with these three. Could you please show how to solve? I don't need to see the solution, just what steps I need to take for each (every smallest detail please). 1. A box weighing 150 N is at rest on a horizontal floor. The ...
Friday, October 23, 2015 by Anonymous

Physics
A ball is thrown vertically and reaches a height of 25m. What was it's initial velocity?
Friday, October 23, 2015 by Haley

Physics
A ball is released and allowed to fall freely. How far will it have fallen in 2 seconds?
Friday, October 23, 2015 by Haley

Physics
A ball is thrown vertically into the air with a velocity of 10ms to the negative 1 power. What will its displacement be after 1.5 seconds?
Friday, October 23, 2015 by Haley

Physical Science-Physics
You need to pick up a book off the floor and place it on a table top that is 0.78 m above ground. You expend 1.56 J of energy to lift the book. The book has an acceleration of 1.54 m/s squared. What is the book's mass?
Friday, October 23, 2015 by Gracie

College Physics
A student throws a 140 g snowball at 7.5 m/s at the side of the schoolhouse, where it hits and sticks. What is the magnitude of the average force on the wall if the duration of the collision is 0.19 s ?
Friday, October 23, 2015 by Anonymous

Physics
How much work is done by a 45-N force acting 35 degrees above the horizontal in pulling a block 9 m across a horizontal surface?
Friday, October 23, 2015 by Abbie

Physics
Find the work necessary to run a football (1 lb) from the 2-m mark to the 52-m mark.
Friday, October 23, 2015 by Mirania

physics -plz help
1) A car is moving at 100 km/hr. Its mass is 950 kg. Find its KE. 2) What force is needed to accelerate a 1300-kg car from rest to 20 m/s in 80 m? 3) A 1200-kg car going 30 m/s skids to rest. The friction force is 6000 N. How far does it skid?
Friday, October 23, 2015 by Salmon24

Physics
I need help with these two. 1. A horizontal force pulls a 20-kg box across the floor with constant speed. μs is 0.60, how much work does F do in moving the cart 3.0 m? 2. A 400 lb load of bricks is to be lifted to the top of a scaffold 30 feet high. How much work to lift ...
Friday, October 23, 2015 by Yurii

physics
The chimney of a stationary toy train consists of a vertical spring gun that shoots steel balls a meter or so straight into the air – so straight that the ball always falls back into the chimney. If the train is moving, under which condition will the ball fall back into ...
Friday, October 23, 2015 by Annonymous

physics
A 38 kg penguin is sliding across a patch of ice, starting at 13 m/s. If the coefficient of friction is .12, how far will the penguin slide before incomes to a halt.
Friday, October 23, 2015 by marie

physics
The chimney of a stationary toy train consists of a vertical spring gun that shoots steel balls a meter or so straight into the air – so straight that the ball always falls back into the chimney. If the train is moving, under which condition will the ball fall back into ...
Friday, October 23, 2015 by Annonymous

physics
a train is moving at 30m/s when the brakes are applied the retardation is 2m/s (square). find the velocity after 10sec and the time taken for the tree to come to rest
Friday, October 23, 2015 by abiee

physics
a train is moving at 30m/s when the brakes are applied the retardation is 2m/s (square). Find the velocity after 10sec and the time taken for train to come to rest
Friday, October 23, 2015 by abiee

physics
There is a car turning on an unbanked road. The mass of the car is 2000kg moving at constant speed 36mph. The radius of the unbanked curve is 100m. the driver sees an obstacle at 20m ahead along the curve. he presses the brakes and expects to have a constant deceleration along...
Friday, October 23, 2015 by daniel

Calrary science secondly school taraku
Physics.p: a stone whirled at the end of a rope 30cm long makes 10 complete in 2seconds find the angular velocity the lnear speed the distance covered in 5seconds
Friday, October 23, 2015 by Tsavgbir moses

Physics
A person is trying to judge whether a picture (mass = 2.37 kg) is properly positioned by temporarily pressing it against a wall. The pressing force is perpendicular to the wall. The coefficient of static friction between the picture and the wall is 0.760. What is the minimum ...
Thursday, October 22, 2015 by Hannah

Physics
A wet bar of soap slides down a ramp 9.4 m long inclined at 8.0∘ . How long does it take to reach the bottom? Assume μk = 0.064.
Thursday, October 22, 2015 by catherine

Physics
A rocket blasts off from rest and attains a speed of 53.8 m/s in 17.4 s. An astronaut has a mass of 67.2 kg. What is the astronaut's apparent weight during takeoff?
Thursday, October 22, 2015 by Hannah

PHYSICS
How much heat energy is required to change 40g of ice at -10K to water at 70K? [Specific heat of ice=2100J/KgK Specific heat of water 4200J/KgK]
Thursday, October 22, 2015 by HEJUMACLA

Physics
A child in a boat throws a 5.90-kg package out horizontally with a speed of 10.0 m/s. The mass of the child is 26.6 kg and the mass of the boat is 38.2 kg . Calculate the velocity of the boat immediately after, assuming it was initially at rest.
Thursday, October 22, 2015 by Anon

Physics
A 4.36 kg block free to move on a horizontal, frictionless surface is attached to one end of a light horizontal spring. The other end of the spring is fixed. The spring is compressed 0.144 m from equilibrium and is then released. The speed of the block is 1.18 m/s when it ...
Thursday, October 22, 2015 by Alex

Physics
A car is travelling at 2 0m/s when it pulls out to pass a truck that is travelling at only 18 m/s the car accelerates at 2 m/s square for 4 sec and then maintains this new velocity. if the car was originally 8 mtrs behind the truck when it pulled out to pass , how far in front...
Thursday, October 22, 2015 by Neeraj

physics
A circular wire is connected to a galvanometer. A solenoid is placed inside the circular wire. The solenoid has 520 turns per meter, a cross-sectional area of 0.007 m^2 and a current charge from 0A to 0.7A in 1.25 ms. The circular wire has a n are of 0.01m^2 and a resistance ...
Thursday, October 22, 2015 by carolyn

physics
A person walks 28.8 degrees north of east for 2.06 km. Another person walks due north, then due east to arrive at the same location. How far due north would this person walk? Answer in units of km work: 2.06sin28.8??? Don't know where to go
Thursday, October 22, 2015 by Anonymous

Physics
what quantities are needed to describe motion -is it to know how position changes with time what are 2 pictorial methods to describe motions??
Thursday, October 22, 2015 by anonymous

physics eq check
just wanted to know if this is a correct substitution, we are given kinetic energy, and want the debroglie wavelength, that eq is lamba = h / p. = h/ mv Momentum in terms of KE: 1/2 m (p/m)^2 1/2 m p^2/m^2 KE = p^2/2m so... mv can be substituted as squareroot (2*m*KE) in the h...
Thursday, October 22, 2015 by paul

Physics
The mass of a beetle is 0.000004kg. If a beetle's center of mass rises 0.75 mm while it is pushing against the floor and then continues to travel up to a height of 250 mm above the floor, what is the magnitude of the force exerted by the floor on the beetle?
Thursday, October 22, 2015 by Tyler

Physics
what quantities are needed to describe motion -to know how position changes with time
Thursday, October 22, 2015 by anonymous

Science/physics
Two vectors A and B have magnitude A = 3.00 and B = 3.00. Their vector product is A x B= -5.00k + 2.00i. What is the angle between A and B? According to the answer, the angle is 37 degrees. I see where this comes from. However, we know that sin(36,75)=sin(143,25) So the ...
Thursday, October 22, 2015 by Tarrok

Intellectual Academy
Pls show me the steps how to work this physics question:A pulley system of 4 pulleys is used to raise a loan of mass 50kg vertically,if its effeciency is 80%,determine the minimum effort required to raise the load(g=10ms-2)?
Thursday, October 22, 2015 by Joy

Physics
Two blocks with masses m1 = 24.3 kg and m2 = 66.9 kg, shown in the figure, are free to move. The coefficient of static friction between the blocks is 0.34 but the surface beneath m2 is frictionless. What is the minimum force F required to hold m1 against m2
Thursday, October 22, 2015 by Phil

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Homework Help: Science