Tuesday
September 1, 2015

Homework Help: Science: Physics

Recent Homework Questions About Physics

physics
Find the net torque on the wheel in the figure below about the axle through O perpendicular to the page, taking a = 5.00 cm and b = 23.0 cm. (Indicate the direction with the sign of your answer. Assume that the positive direction is counterclockwise.) f1= 10 f2= 9 f3=12
Wednesday, March 4, 2015 by alba

physics
a bus is travelling on a horizontal road at a velocity of 126 km/h when the bus driver notices an object in the road. the brakes are applied and the bus is brought to rest over a distance of 150m. the frictional resistance is 2500n and the bus has a mass of 6000 kg. calculate ...
Wednesday, March 4, 2015 by Enoch

Physics
3. Think about this pulling scenario: A 60 N force pulls three boxes across a surface with no friction. T1 is the tension force the rope on the left pulls with at both ends, and T2 is the force the rope on the right pulls with on both ends. (a) Draw diagrams of the three boxes...
Wednesday, March 4, 2015 by Ke

physics
7. A cart like the one we use in lab accelerates down a 20° incline (and since the wheels are smooth, ignore friction for now). Break the force of gravity into components (leave mass as m for now), find the cart’s acceleration, and determine how long it should take ...
Wednesday, March 4, 2015 by Ke

physics
a parent pushes a kid on a swing, A) If the child on the swing rises 2m above the lowest point during each cycle, what is her speed at the lowest point of the swing? B)If the beginning of a cycle (2m above the lowest point) the child is given a push so that her starting speed ...
Wednesday, March 4, 2015 by chris

Physics
A driver of a car going 90 km/h suddenly sees the lights of a barrier 40.0 m ahead. It takes the driver 0.75 s to apply the brakes, and the average acceleration during braking is -10 m/s2. (a) Compute for the total displacement of the car to determine whether the car hits the ...
Wednesday, March 4, 2015 by Leila

Calculus Physics
A glass of orange juice is on the floor of a subway car traveling along a straight path at constant velocity. Everything's fine. The coefficient of static friction between the glass and the floor is 0.32. The subway suddenly accelerates forward. What is the maximum ...
Wednesday, March 4, 2015 by Mik

Physics
A baseball player with a mass of 79 kg slides into homeplate. The coefficient of kinetic friction between the player and the ground is μk = 0.632. If the player comes to rest after 1.04 s, what is his initial speed?
Wednesday, March 4, 2015 by danny

physics
In a relay race, each contestant runs a distance 25.7m while carrying an egg balanced on a spoon, turns around, and comes back to the starting point. Jenny runs the first distance 25.7m in a time t1 = 20.0s . On the return trip she is more confident and takes only time t2 = 14...
Wednesday, March 4, 2015 by Kikobay

Physics
Energy Budget for a Rocket in Free Space: Recall the analysis of the rocket engine in Project I, Flight of the Rocket. Although the momentum of the rocket and its exhaust is conserved (constant), their energy is not; energy must be supplied by the combustion of fuel. WARNING: ...
Wednesday, March 4, 2015 by Steve

Physics
Bob starts spinning his hammer at a rate of 2.00 rad/s^2. At the same time, he starts running towards Jim at 4.00 m/s^2. The distance from the end of the hammer to Bob's elbow is 1.20 m. If Bob takes 3 seconds before he launches the hammer at Jim, what is the resultant ...
Wednesday, March 4, 2015 by Lisa

physics
Before starting this problem, review Conceptual Example 7. The force vector A has a magnitude of 97.0 newtons (N) and points due east. The force vector B has a magnitude of 107 N and points 71.4 ° north of east. Find the (a) magnitude and (b) direction of A - B. (Give the...
Wednesday, March 4, 2015 by n

Physics
A .5 kg football is thrown and reaches a stationary receiver with a speed of 15m/s. The receiver catches the ball and brings it to rest in .2 sec. a) What is the impulse delivered to the ball? b) What is the average force exerted on the receiver?
Wednesday, March 4, 2015 by Rachel

Physics
Starting from rest, a 4-kg block slides 10 m down a frictionless 30 degree incline. Determine the work done on the block by a) The force of gravity b) The normal force c) All of the forces (the net force) on the block d) Find the Kinetic energy of the block at the end of the ...
Wednesday, March 4, 2015 by Rachel

Physics
Please help me with this question How much work is done by a boy of mass 70kg who ran up a flight of 31steps each15m high. Take g=10m/s^2
Wednesday, March 4, 2015 by Cassandra

Physics
A square coil with 30 turns has sides that are 18 cm long. When it is placed in a 0.31-T magnetic field, a maximum torque of 0.60 N⋅m is exerted on the coil. What is the current in the coil?
Tuesday, March 3, 2015 by Keith

Physics
Energy Budget for a Rocket in Free Space: Recall the analysis of the rocket engine in Project I, Flight of the Rocket. Although the momentum of the rocket and its exhaust is conserved (constant), their energy is not; energy must be supplied by the combustion of fuel. WARNING: ...
Tuesday, March 3, 2015 by Steve

physics
A 4 cm candle sits 15 cm in front of a converging lens with a focal length of 6.0 cm. Draw a ray diagram showing the image used and determine the image distance and magnification. Please help me answer!
Tuesday, March 3, 2015 by sarah

Physics
A 39-turn circular coil of radius 3.20 cm and resistance 1.00 Ω is placed in a magnetic field directed perpendicular to the plane of the coil. The magnitude of the magnetic field varies in time according to the expression B = 0.010 0t + 0.040 0t2, where B is in teslas and...
Tuesday, March 3, 2015 by Chris

Physics
Can someone help me solve this one? I've tried it a few times, but I don't think I'm getting it right. A block of mass M = 2.2 kg starts from rest at a height of 3.6 m on a fixed inclined plane. The coefficient of kinetic friction between the block and the incline ...
Tuesday, March 3, 2015 by James

Physics
Can someone walk me through how to work this? It's worded weirdly and I'm not sure how to solve it. Mass M1= 2.2 kg lies on a frictionless table, pulled by another mass M2= 4.1 kg under the in of Earth's gravity. a) What is in N the net force acting on the system ...
Tuesday, March 3, 2015 by James

Physics
Can someone walk me through how to work this? A block is being pushed up a frictionless incline by an applied horizontal force, F=12.7N. (The angle is θ = 23.80° and the mass is 1.70kg. a) How many forces are acting on the block? b) How many of those forces are along ...
Tuesday, March 3, 2015 by James

physics
A constant torque of 200Nm turns a wheel about its centre. The moment of inertia about this axis is 100kgm^2
Tuesday, March 3, 2015 by ben

Physics
A cannon shoots a cannonball with a mass of 20 kg and a net force of 2000 N a) label the three force pairs(HORIZONTAL ONLY) b) What is the acceleration of the cannonball? c) Does the cannon continue to move/ Explain why or why not. Specify which force will affect this.
Tuesday, March 3, 2015 by Nam Nguyen

physics
Object 1 has a velocity of 3m/s and a mass of 5kg. Object 2 also has a mass of 5kg but isn't moving. Object 1 collides with Object 2 and they move off together. Work out their speed using the principle of conservation of momentum.
Tuesday, March 3, 2015 by help me

physics
a stone is thrown upward with a speed of 24.0m/s how fast is it moving when it reaches a height of 13.0m?
Tuesday, March 3, 2015 by oratile

Physics
Consider an air-bubble level that is sitting on a horizontal surface. Initially, the air bubble is in the middle of the horizontal glass tube. (a) If the level is pushed and a force is applied to accelerate it, which way would the bubble move? Which way would the bubble move ...
Tuesday, March 3, 2015 by David

Physics
A 1500-kg blue car is travelling south, and a 2000-kg red sports car is travelling west. If the momentum of the system consisting of the two cars is 8000kg.m/s directed at 60 degrees west of south, what is the speed of each car?
Tuesday, March 3, 2015 by Reynaldo

Physics
A 100 kg crate rest at the back of the bed of a pick up truck. The length of the crate is 1 m in the length of the bed is 4 m. There is no friction between the bed of the truck in the crate. If the truck is traveling at 25 m/s just before it hits the wall, how long before the ...
Tuesday, March 3, 2015 by David

Physics
a billiard ball moving at 4.0 m/s strikes another billiard ball at rest and moves off at 3.46 m/s in a direction of 30 degrees from the original of the motion. What is the velocity of the target ball?
Tuesday, March 3, 2015 by Reynaldo

physics
The weight of an object is 480N on the earth and 120N on the moon,calculate the mass of the object on the moon
Tuesday, March 3, 2015 by rebone

physics
If a man weighs 820N on d earth what would be on Jupiter, where the acceleration due to gravity is 25.9m/s
Tuesday, March 3, 2015 by ikeokwu stephen chidebere

Physics
A chair of weight 75.0N lies atop a horizontal floor; the floor is not frictionless. You push on the chair with a force of F = 45.0N directed at an angle of 40.0¡ã below the horizontal and the chair slides along the floor. Using Newton's laws, calculate n, the...
Tuesday, March 3, 2015 by Boxiang

physics
An object uniformly accelerates at a rate of 1.20m/s^2 east. While accelerating at this rate, the object is displaced 470.4m east in a time of 28 s. What velocity did this object reach in this time ? I used Vf=Vi+at which will be Vf=(1.20)(28) but i feel this isn't the way...
Tuesday, March 3, 2015 by Dania

Physics
A 4.12 kg mass undergoes an acceleration along both the x and y directions. Ax = -2.60 m/s2 and Ay = 3.50 m/s2. Find the magnitude of the resultant force. Answer in units of N.
Monday, March 2, 2015 by Joey

physics
Jane and John, with masses of 50kg and 68kg , respectively, stand on a frictionless surface 13m apart. John pulls on a rope that connects him to Jane, giving Jane an acceleration of 0.86m/s2 toward him. What is the magnitude of the John's acceleration? If the pulling force...
Monday, March 2, 2015 by Herb

college physics
A fisherman poles a boat as he searches for his next catch. He pushes parallel to the length of the light pole, exerting a force of 245 on the bottom of a shallow lake. The pole lies in the vertical plane containing the boat's keel. At one moment, the pole makes an angle ...
Monday, March 2, 2015 by molly

physics
An atomic nucleus at rest decays radioactively into an alpha particle and a different nucleus.
Monday, March 2, 2015 by Anonymous

physics
NEEDS HELP PLEASE!! A 100kg shot putter is putting a shot 4kg. Just before he releases the shot, he is in the air (feet are off the ground). At this instant, the only force he exerts against the shot is an 800N horizontal force directed forward. a-what is his horizontal ...
Monday, March 2, 2015 by sam

physics
A negatively charged balloon has 4.5 μC of charge. How many excess electrons are on this bal- loon? The elemental charge is 1.6 × 10−19 C. Answer in units of electrons.
Monday, March 2, 2015 by Anonymous

physics
A 4.40kg bucket of water is accelerated upward by a cord of negligible mass whose breaking strength is 74.0N
Monday, March 2, 2015 by AHMED

Calculus Physics
Imagine a spaceship on its way to the moon from the earth. Find the point, as measured from the center of the earth, where the force of gravity due to the earth is balanced exactly by the gravity of the moon. This point lies on a line between the centers of the earth and the ...
Monday, March 2, 2015 by danny

Calculus Physics
A glass of orange juice is on the floor of a subway car traveling along a straight path at constant velocity. Everything's fine. The coefficient of static friction between the glass and the floor is 0.32. The subway suddenly accelerates forward. What is the maximum ...
Monday, March 2, 2015 by danny

Physics
Analyze the flight of a projectile moving under the influence of gravity (mg) and linear, i.e., laminar- flow drag (fD = bv, with b > 0 constant). Neglect \Phase I"; assume the projectile is launched from the origin at speed v1 and angle 1 above the horizontal. WARNING...
Monday, March 2, 2015 by Alyssa

Physics
A 100kg object moving at 20 m/s comes to a stop over distance of 40 m. What is the coefficient of dynamic fiction between the object and the ground? I tried to work it out with the formula, but I'm really confused. Please help.
Monday, March 2, 2015 by Mary

physics
The largest tension that can be sustained by a stretched string of linear mass density μ, even in principle, is given by τ = μc2, where c is the speed of light in vacuum. (This is an enormous value. The breaking tensions of all ordinary materials are about 12 ...
Monday, March 2, 2015 by barış

Physics
An outdoor swimming pool contains 100000 kilogram of water how much energy is needed yo heat water from 15 celius to 20 celius
Monday, March 2, 2015 by Anonymous

physics
Heat can never flow from ________. how come it is cold to hot?
Monday, March 2, 2015 by Sabina

Basic Physics
There is a rocket on a stage connected a spring with the spring constant k(N/m). The weights of the rocket and the stage are m(kg) and M(kg), respectively. The length of the spring without the stage and rocket or free is h0(m) and it becomes shrunk to h(m) on putting the ...
Monday, March 2, 2015 by Sarwar

help! Physics
I've been getting this question wrong so many times! What is the relationship between the coefficient of friction and the time that it takes the object to reach the bottom of the ramp?
Monday, March 2, 2015 by Stephanie

modern physics
a hunter on the ground fires a bullet in the northeast direction which strikes a deer 0.25 metre away from him, the bullet travel with a speed of 1800m/hr.at the instant an airplane is directly over the hunter at an altitude of one metre and is traveling due east with a ...
Sunday, March 1, 2015 by martin

Physics
A baseball pitcher delivers a fastball that crosses the plate with an angle of 7.89 degrees relative to the horizontal and a speed of 87.5 mph. The ball (mass 0.145 kg) is hit back over the head of the pitcher at an angle of 38.03 degrees with respect to the horizontal and a ...
Sunday, March 1, 2015 by Kathy

physics
A seesaw has a mass of 30 kg, a length of 3.0 m, and fulcrum beneath its midpoint. It is balanced when a 50-kg person sits on one end and a 65-kg person sits on the other end.Locate the center of mass of the seesaw (a distance from the 50-kg person)
Sunday, March 1, 2015 by clay

physics
A particle moves half distance by 20 m/s and stay half distance moves by 30 m/s. Average speed of total journey should be?
Sunday, March 1, 2015 by Pradeep

Physics
A 7.5 kg box is on a table. What is the normal force acting on the box in each of the following situations? a) You leave the box alone. b) You push down on the box with a force if 20 N. c) You pull up on the box with a force of 20 N.
Sunday, March 1, 2015 by Ashley

Physics
A top is a toy that is made to spin on its pointed end by pulling on a string wrapped around the body of the top. The string has a length of 80 cm and is wound around the top at a spot where its radius is 2.0 cm. The thickness of the string is negligible. The top is initially ...
Sunday, March 1, 2015 by Cass

Physics
A worker pushes horizontally on a 25 kg crate resting on ground level. The coefficients of static and kinetic friction are 0.4 and 0.3.? a) How much force must he apply to start the crate moving? b) After the crate has stereo moving, how much force must he apply to move the ...
Sunday, March 1, 2015 by Ashley

Physics
A 24.8-g bullet is fired from a rifle. It takes 2.15 × 10-3 s for the bullet to travel the length of the barrel, and it exits the barrel with a speed of 778 m/s. Assuming that the acceleration of the bullet is constant, find the average net force exerted on the bullet.
Sunday, March 1, 2015 by Chris

Physics
The brakes of a truck cause it to slow down by applying a retarding force of 7760 N to the truck over a distance of 870 m. What is the work done by this force on the truck?
Sunday, March 1, 2015 by Chris

physics
A 100kg shot putter is putting a shot 4kg. Just before he releases the shot, he is in the air (feet are off the ground). At this instant, the only force he exerts against the shot is an 800N horizontal force directed forward. a-what is his horizontal acceleration at this ...
Sunday, March 1, 2015 by aaron

physics
a jeepney from rest accelerates unit fromly covers the time 3.25s. and covers in 15m. Determine the acxeleration of jeepney
Sunday, March 1, 2015 by azihr

Physics
There is an 8 meter tall hill with a circular radius of 20 meters. What is yhe minimum speed a car needs to momentarily lose contact with the road?
Sunday, March 1, 2015 by Valerie

Physics
What is the final temperature reached by the addition of 11.4 grams of steam at 100C to 681 grams water at 25C in an aluminum calorimeter having a mass of 781 grams? C of water=1 cal/gc C of aluminum= 0.22 cal/gc L steam= 540cal/g My Attempt Qloss=Qgain Qst+Qhw=Qcup+Qcw ml+mcT...
Sunday, March 1, 2015 by Help2

physics
Grant accelerates a 1kg ball 5.0m/s2 horizontally. The vertical acceleration of the ball is zero. The force of gravity is the only external force acting on the ball other than the forces Grant exerts on it. a-How large is the horizontal force grant exerts on the ball at this ...
Sunday, March 1, 2015 by aaron

Physics
An unstable nucleus with a mass of 18.0 ✕ 10-27 kg initially at rest disintegrates into three particles. One of the particles, of mass 4.1 ✕ 10-27 kg, moves along the positive y-axis with a speed of 8.0 ✕ 106 m/s. Another particle, of mass 7.7 ✕ 10-...
Sunday, March 1, 2015 by Betty

Physics 1
In recent years, scientists have discovered hundreds of planets orbiting other stars. Some of these planets are in orbits that are similar to that of earth, which orbits the sun (Msun = 1.99 × 10^(30) kg) at a distance of 1.50 × 10^(11) m, called 1 astronomical ...
Sunday, March 1, 2015 by Skyler

physics(urgent answer pls)
A projectile is launched with 30m/s at an angle of 60degree with d horizontal (a) find d position of the projectile,and d magnitude and direction of its velocity at t=2s (b) find d time when d ball reaches the highest point (c) find d horizontal range
Sunday, March 1, 2015 by ben

physics
A projectile is launched with 30m/s at an angle of 60degree with d horizontal (a) find d position of the projectile,and d magnitude and direction of its velocity at t=2s (b) find d time when d ball reaches the highest point (c) find d horizontal range
Sunday, March 1, 2015 by tolu

Physics
A group of soldiers hid at the bottom and against the wall of a 100 m. high cliff. Unknown to them, the Evil rebels have positioned a cannon on top of the cliff; 8,000 m. from the edge. If the cannon has a muzzle speed of 320 m/sec, how close to the bottom edge of the cliff ...
Sunday, March 1, 2015 by akocciara

physics
a block of ice slides down a 45degree inclined plane in twice the time it takes to slide down a 45degree frictionless inclined plane. what is the coefficient of kinetic friction between the ice block and the plane?
Sunday, March 1, 2015 by ogba

physics
a block of ice slides down a 45degree inclined plane in twice the time it takes to slide down a 45degree frictionless inclined plane. what is the coefficient of kinetic friction between the ice block and the plane?
Sunday, March 1, 2015 by Anonymous

physics
A car has a uniform velocity of 108km/h. How far does it travel in 1/2 min
Sunday, March 1, 2015 by Godspower

physics
Why do you think the wave aspect of light was discovered earlier than its particle aspect?
Sunday, March 1, 2015 by Channing

physics
A bug starts walking away from the top of a spherical ball of ice and will start to slip when the normal force exerted on it drops to 1/2 of its weight. If the ice ball has a diameter of 34 cm, how far can the bug walk before it begins to slip?
Sunday, March 1, 2015 by wayne

Physics
A model helicopter and its load have a combined mass of 3.5 kg. Find the upward average force, in Newtons, exerted by the air if the helicopter is originally moving downward at 10 m/s and is brought to rest with constant acceleration in a distance of 50 m.
Sunday, March 1, 2015 by wayne

Physics
Three cylindrical blocks x, y and z are made of different materials of densities 2g/cm3, 5g/cm3 and 10g/cm3 respectively. If the side of each block resting on a level surface has an area of 2cm2, 4cm2 and 6cm2 and the height of block x is 10cm calculate; 1) weight of block x 2...
Saturday, February 28, 2015 by JUBA

Physics
A 4.1 g dart is fired into a block of wood with a mass of 20.2 g. The wood block is initially at rest on a 1.2 m tall post. After the collision, the wood block and dart land 2.6 m from the base of the post. Find the initial speed of the dart.
Saturday, February 28, 2015 by Betty

Physics
An unstable nucleus with a mass of 18.0 ✕ 10-27 kg initially at rest disintegrates into three particles. One of the particles, of mass 4.1 ✕ 10-27 kg, moves along the positive y-axis with a speed of 8.0 ✕ 106 m/s. Another particle, of mass 7.7 ✕ 10-...
Saturday, February 28, 2015 by Carol

physics
A 2200 kg car traveling at 8.7 m/s collides with a 2750 kg car that is initially at rest at the stoplight. The cars stick together and move 2.00 m before friction causes them to stop. Determine the coefficient of kinetic friction between the cars and the road, assuming that ...
Saturday, February 28, 2015 by Amy

physics
A 39-turn circular coil of wire has a diameter of 1.2m. It is placed with its axis along the direction of the Earth's magnetic field of 58μT at 52° below the horizontal, and then in 0.16s it is flipped 180°. a) What is volts the magnitude of the average ...
Saturday, February 28, 2015 by Katie

physics
a rectangular loop with a=6.0 cm, and b=4.0 cm, moving with a velocity v=8.0 cm/s into an area where the magnetic field is uniform, pointing into the page, and whose magnitude is B= 440 mT. a) What is in volts the induced emf in the loop when the loop is moving in a region ...
Saturday, February 28, 2015 by Ciel

physics
A 3.49 kg mud ball has a perfectly inelastic collision with a second mud ball that is initially at rest. The composite system moves with a speed equal to one-seventh the original speed of the 3.49 mud ball. What is the mass of the second mud ball?
Saturday, February 28, 2015 by Amy

Physics
Two boats are heading away from shore. Boat 1 heads due north at a speed of 4 m/s relative to the shore. Relative to boat 1, boat 2 is moving 35° north of east at a speed of 1.2 m/s. A passenger on boat 2 walks due east across the deck at a speed of 1.3 m/s relative to ...
Saturday, February 28, 2015 by Cetris

Physics
An airplane is flying with a velocity of 248 m/s at an angle of 30.0° with the horizontal, as the drawing shows. When the altitude of the plane is 2.5 km, a flare is released from the plane. The flare hits the target on the ground. What is the angle θ?
Saturday, February 28, 2015 by Cetris

Physics
A fire hose ejects a stream of water at an angle of 30.9° above the horizontal. The water leaves the nozzle with a speed of 26.5 m/s. Assuming that the water behaves like a projectile, how far from a building should the fire hose be located to hit the highest possible fire?
Saturday, February 28, 2015 by Cetris

Physics
Can someone help me with this problem? It requires a lot of visualizing and I've never been great at problems like that. A pair of blocks of mass m1 =29.0 kg, and m2 =58.0 kg, are being pushed on a horizontal surface by a constant forces of magnitude F=87.0 N. The angle &#...
Saturday, February 28, 2015 by James

Physics
A 42 kg man stands on a bathroom scale in an elevator. Starting from rest at the bottom floor, the elevator ascends, attaining its maximum speed of 1.95 m/s in 1.22 s. It travels with this constant speed for the next 7.80 s. The elevator then slows down for 2.20 s and comes ...
Saturday, February 28, 2015 by James

Physics
Hey, I'm studying for my physics class, and I'm not sure how to solve this problem. Can someone walk me through it please? I'd really appreciate any help! John throws a baseball from the edge of a cliff with an initial velocity of 17.0 m/s at an angle 27.0° ...
Saturday, February 28, 2015 by James

Physics
In diving to a depth of 785 m, an elephant seal also moves 410 m due east of his starting point. What is the magnitude of the seal's displacement?
Saturday, February 28, 2015 by Cetris

Physics
In a football game a kicker attempts a field goal. The ball remains in contact with the kicker's foot for 0.050 s, during which time it experiences an acceleration of 380 m/s2. The ball is launched at an angle of 51° above the ground. Determine the horizontal and ...
Saturday, February 28, 2015 by Cetris

Physics
How will the balancing length of a potentiometer be affected if resistance in the primary cell is increased or decreased? Will the balancing length change if a resistance is introduced before the jockey ?
Saturday, February 28, 2015 by vin

Physics
A solid cylinder is pivoted at its center about a frictionless axle. A force is applied to the outer radius of 1.27 m at an angle of 30 ◦ above the tangential and exerts a force of 5 N. A second force is applied by wrapping rope around the inner radius of 0.576 m, which ...
Saturday, February 28, 2015 by Caleb

physics
an arrow is shot into the air with an initial velocity of 100m is at elevation of 60 degree find. a the time of flight b the maximum height attained c the range
Saturday, February 28, 2015 by Anonymous

Physics
A 2302 kg block of granite is pulled up an incline that has an angle of inclination of 17.0 o with a constant speed of 2.22 m/s by a steam winch (see Figure). The coefficient of kinetic friction between the block and the incline is 0.340. How much power must be supplied by the...
Saturday, February 28, 2015 by Lauren

physics
the water in a 0.5 km wide river is flowing at 5 m/sec from west to east. a man row a boat with a velocity of 13 m/sec in a direction of north west relative to water. find the time taken to cross the river so that man reaches exactly at same point to opposite end of the river...
Saturday, February 28, 2015 by ali

physics
an anti aircraft gun fires at an elevation of 60 degree at an enemy air at 10.000 m above the ground. AE what speed must cannombe shot to hit the plane at the height (g=10m50)
Saturday, February 28, 2015 by Anonymous

physics
A rectangular loop with a=2.9 cm, and b=1.9 cm, moving with a velocity v=3.8 cm/s into an area where the magnetic field is uniform, pointing into the page, and whose magnitude is B= 450 mT. a) What is in volts the induced emf in the loop when the loop is moving in a region ...
Saturday, February 28, 2015 by Trisha

Physics
As your vacation job, you are driving a concrete mixer (mass 3300 kg). While driving down a hill (angle α = 29° with the horizontal), suddenly, a cow steps out on the road. You hit on the brakes, and with each locked wheel leaving 24 meters of skid marks, you come to ...
Friday, February 27, 2015 by Breaking on a hill

Physics
A 755 N diver is standing on a platform 10.0 m above the surface of the water. What is the diver's speed when he hits the water? (disregard friction)
Friday, February 27, 2015 by Einna

college physics
The builders of the pyramids used a long ramp to lift 21000-kg (21-ton) blocks. If a block rose 1.1 m in height while traveling 20 m along the ramp’s surface, how much uphill force was needed to push it up the ramp at constant velocity?
Friday, February 27, 2015 by Martez

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