Thursday

January 19, 2017
**PHYsics**

A sprinter of mass 70.7 kg runs at a constant speed of 10.5 m/s in a straight line. Find the extra force the sprinter must exert on the ground to round a curve of radius 10.6 m.

*Monday, October 31, 2016 by Brint*

**Physics**

2. The average atmospheric pressure at sea level is approximately 101 000 Pa. If the density of air at 0◦C is approximately 1.3 kg , how high does the atmosphere extend?

*Monday, October 31, 2016 by Merdreik*

**Physics**

A long, straight wire with a circular cross section of radius R carries a current I. Assume that the current density is not constant across the cross section of the wire, but rather varies as J=αr, where α is a constant. A) By the requirement that J integrated over ...

*Monday, October 31, 2016 by Ayaka*

**Physics**

A piece of copper ball of mass 30grams at 150 degree celcius is placed in a copper calorimeter of mass 70gams containing 60grams of waterof copper 40degree celcius if the final ofthe mixture is 50degree celcius calculate the specific heat capacity of copper (specific heat ...

*Monday, October 31, 2016 by Elizabeth Avan*

**Physics**

A student holds a bike wheel and starts it spinning with an initial angular speed of 7.0 rotations per second. The wheel is subject to some friction, so it gradually slows down. In the 10-s period following the inital spin, the bike wheel undergoes 60.0 complete rotations. ...

*Monday, October 31, 2016 by Morgan*

**Physics**

A uniform disk of radius 0.485 m and unknown mass is constrained to rotate about a perpendicular axis through its center. A ring with same mass as the disk\'s is attached around the disk\'s rim. A tangential force of 0.247 N applied at the rim causes an angular ...

*Monday, October 31, 2016 by Morgan*

**Physics**

A flywheel in the form of a uniformly thick disk of radius 1.48 m, has a mass of 43.6 kg and spins counterclockwise at 303 rpm. Calculate the constant torque required to stop it in 2.50 min.

*Monday, October 31, 2016 by Morgan*

**Physics**

Six dogs pull a two-person sled with a total mass of 280 kg. The coefficient of kinetic friction between the sled and the snow is 0.080. The sled accelerates at 0.65 m/s2 until it reaches a cruising speed of 15 km/h. What is the team's maximum power output during the ...

*Sunday, October 30, 2016 by Alex*

**Physics**

A pile driver lifts a 450 kg weight and then lets it fall onto the end of a steel pipe that needs to be driven into the ground. A fall of 1.5 m drives the pipe in 45 cm. What is the average force exerted on the pipe?

*Sunday, October 30, 2016 by Alex*

**Physics**

A concave, spherical mirror and a thin, converging lens are both measured in air (n=1.0) to have the same focal length, ff. Both the mirror and the lens are then placed under water (n=1.33) and their focal lengths are measured again. For both the mirror and the lens state ...

*Sunday, October 30, 2016 by Urgent Help Needed Please!!!*

**Physics 11 urgent Steve, bob, damon pls**

A 30 kg student pushes a 20kg box on frictionless surface. If student accelerates at 0.8m/s^2(N),what is acceleration of bix. now why does the box acceerate towards south, if it is being pushed north should it not move north.

*Sunday, October 30, 2016 by IZAAK SiDney Dunkan*

**physics **

A uniform ladder of length 20.0m and weight 750 N is propped up against a smooth vertical wall with its lower end on a rough horizontal surface. The coefficient of friction between the ladder and this horizontal surface is 0.40. (b) Work out and add the numerical values of ...

*Sunday, October 30, 2016 by Michael*

**Physics**

A soccer play kicks the ball toward a goal that is 29m in front of him. The ball leaves his foot at a speed of 19m/s and at an angle of 32degrees above the ground. Find the speed of the ball when the goalie catches it in front of the net. my work: vxi=16.1 vxf=16.1 ax=0

*Sunday, October 30, 2016 by Morgan*

**university physics**

An object at rest explodes into three fragments. The figure shows the momentum vectors of two of the fragments: vector P1 is directed along the px axis and has a magnitude of 74.0 kg m/s. vector P2 is at an angle of 300.Â° measured counterclockwise from the positive ...

*Sunday, October 30, 2016 by katarina*

**Physics 11 steve or any physics teacher helpURGENT**

A 30kg student pushes a 20kg box on a frictionless surface. If student accelerates at 0.80 m/s^2, what is acceleration of the box. My question is why does the box accelerate in opposite direction of the boy, and how does the frictionless surface affect this question?

*Sunday, October 30, 2016 by Brayden Hugo*

**Physics**

Which are in static equilibrium? 1. A box sliding down a ramp. 2. A baseball after being hit. 3. A box sliding along a horizontal surface. 4. A perfectly upright freely spinning top 5. A freely swinging simple pendulum 6. A spinning astronaut floating out in deep space. 7. A ...

*Sunday, October 30, 2016 by Jerry*

**Quick Physics Question**

Are both linear and angular momentum conserved in static equilibrium ?

*Sunday, October 30, 2016 by Tom*

**physics**

The ice skate of a 210-pound hockey player is in contact with the ice over a 2.5mm x 15cm area. Determine the freezing point of the ice under the blade of the skate?

*Sunday, October 30, 2016 by Joseph*

**Physics**

Person sits on a frictionless stool that is free to try ate but is initially at rest. The person is holding a bicycle wheel (I = 3 kg*m2) that is rotating at 8 Ree/s in a clockwise direction as viewed from above, and the moment of inertia of the person-wheel-stool system is 9 ...

*Sunday, October 30, 2016 by Lester*

**physics**

quarterback throws a pass to a receiver, who catches it at the same height as the pass us thrown, The initial velocity of the ball is 15.0 m/s, at an angle of 25.0 degrees above the horizontal. How long is the ball in the air?

*Sunday, October 30, 2016 by matt*

**Physics**

William Tell must split the apple atop his sonâ€™s head from a distance of 45.1m. When William aims directly at the apple, the arrow is horizontal. At what angle must he aim it to hit the apple if the arrow travels at a speed of 45.956m/s

*Sunday, October 30, 2016 by Rose*

**PHYSICS URGENT URGENT URGENT URGENT HELP NEEDED!!!**

A uniform ladder of length 20.0m and weight 750 N is propped up against a smooth vertical wall with its lower end on a rough horizontal surface. The coefficient of friction between the ladder and this horizontal surface is 0.40. (b) Work out and add the numerical values of ...

*Sunday, October 30, 2016 by Valentina*

**Physics**

An Olympic long jumper is capable of jumping 8.44m. Assuming his horizontal speed is 5.644m/s as he leaves the ground, how high does he go?

*Sunday, October 30, 2016 by Liv*

**Physics**

You throw a 5.5 g coin straight down at 4.0 m/s from a 25-m-high bridge. A) How much work does gravity do as the coin falls to the water below? B)What is the speed of the coin just as it hits the water?

*Sunday, October 30, 2016 by Nathan*

**Physics**

A tennis ball, starting from rest at a height h = 2.10 m, rolls down the hill. At the end of the hill the ball becomes airborne, leaving at an angle of 27.0Â° with respect to the ground. Treat the ball as a thin-walled spherical shell (I = ⅔mrÂ²), ...

*Sunday, October 30, 2016 by Bex*

**Physics**

a bullet fired at a wooden block of thickness 0.15m manages to penetrate the block. if the mass of the bullet is 0.025kg and average resisting force of the wood is 7x 10^3 N , Calculate the sppeed of the bullet just before it hits the wood block

*Sunday, October 30, 2016 by busola*

**Physics**

You must arrange three mystical stones in a line. They have masses 10.0 kg, 7.00 kg,and 3.00 kg. You place the 7.00 kg and 3.00 kg stones 5.00 m apart. Where do you need to place the 10.0 kg stone for the center of mass of the three stones to be 2.25 m from the 7.00 kg stone ...

*Sunday, October 30, 2016 by Rick*

**Physics**

A uniform ladder of length 20.0m and weight 750 N is propped up against a smooth vertical wall with its lower end on a rough horizontal surface. The coefficient of friction between the ladder and this horizontal surface is 0.40. (b) Work out and add the numerical values of ...

*Sunday, October 30, 2016 by Michael*

**physics**

a point charge placed at the origin. Calculate eletric field at a point 2.0m from the Z axis.

*Sunday, October 30, 2016 by alisha ahmed*

**Physics (for Damon)**

Given the following about a spring: mass = 20.0 kg height initial = 5.25 m (above the ground) height final = 2.17 m (above the ground with the mass attached) delta y initial = 0.00 m I have found the following: Spring constant: 63.7N It would take 576J to return the object to ...

*Sunday, October 30, 2016 by George*

**physics**

Calculate the freezing point of water at a depth of 10.0 cm below the surface of the water. The density of the water is 0.9998 g/cm3.

*Sunday, October 30, 2016 by Joseph*

**PHYSICS**

A uniform ladder of length 20.0m and weight 750 N is propped up against a smooth vertical wall with its lower end on a rough horizontal surface. The coefficient of friction between the ladder and this horizontal surface is 0.40. (a) Draw a diagram for the ladder showing all ...

*Sunday, October 30, 2016 by Saphina AlMatary*

**PHYSICS**

A perfect gas at 415 degree centigrade. The volume remains constant at 20 cubic meters and pressure of 1750 Gauge. Calculate the final value of V2 AND T2

*Sunday, October 30, 2016 by Muhammad*

**maths physics **

A particle P, starting from rest at A, moves in a straight line ABCD. It accelerates uniformly at 5ms-2 from A to B. From B to C it travels at constant velocity, and from C to D it slows down uniformly at 4ms-2, coming to rest at D. Given that AB=10m and that the total time P ...

*Sunday, October 30, 2016 by nadun*

**physics**

An object is projected vertically in "V" velocity.After "T" time, another object is projected at the same place in same velocity("V").Find the velocities of stones when they meets.

*Sunday, October 30, 2016 by MAS*

**Physics**

A uniform ladder of length 20.0m and weight 750 N is propped up against a smooth vertical wall with its lower end on a rough horizontal surface. The coefficient of friction between the ladder and this horizontal surface is 0.40. (a) Draw a diagram for the ladder showing all ...

*Sunday, October 30, 2016 by still don't understand; please help*

**physics **

Find the x and y components of A displacement 200km at 34

*Sunday, October 30, 2016 by abdirahman *

**Physics**

A uniform ladder of length 20.0m and weight 750 N is propped up against a smooth vertical wall with its lower end on a rough horizontal surface. The coefficient of friction between the ladder and this horizontal surface is 0.40. (a) Draw a diagram for the ladder showing all ...

*Sunday, October 30, 2016 by urgent help needed*

**physics**

a block B (m2 = 14 kg) is at rest on top of a table. Block B is connected to block A (m1 = 4.8 kg) and block C (m3 = 17 kg) by two strings that each pass over a frictionless pulley installed at the either end of the table. The horizontal surface of the table exerts a 32-N ...

*Sunday, October 30, 2016 by Amy*

**Physics**

Given the following about a spring: mass = 20.0 kg height initial = 5.25 m (above the ground) height final = 2.17 m (above the ground with the mass attached) delta y initial = 0.00 m There are several questions I must answer from this. 1. What is the value of the spring ...

*Saturday, October 29, 2016 by George*

**physics**

A volume of 140 cm3 of an ideal gas has an initial temperature of 20Â°C and an initial pressure of 1 atm. What is the final pressure if the volume is reduced to 120 cm3 and the temperature is raised to 40Â°C?

*Saturday, October 29, 2016 by Sue*

**physics**

What is true about microscopic properties of an object? 1) They are just small versions of the macroscopic properties. 2) They are the properties of particles that make up the object. 3) They are the average of many properties of individual particles. 4) They are overall large...

*Saturday, October 29, 2016 by Heather*

**Physics**

Given the following about a spring: mass = 20.0 kg height initial = 5.25 m (above the ground) height final = 2.17 m (above the ground with the mass attached) delta y initial = 0.00 m There are several questions I must answer from this. 1. What is the value of the spring ...

*Saturday, October 29, 2016 by George*

**physics**

Given that 1 g of hydrogen combines completely with 8 g of oxygen to form water, how much water can you make with 10 g of hydrogen and 24 g of oxygen?

*Saturday, October 29, 2016 by Beth*

**physics**

A ham sandwich consists of one slice of ham (9 grams) and two slices of bread (25 grams each). You have 1 kg of ham and 1.2 kg of bread. You make as many sandwiches as you can. How many sandwiches did you make? 1) How many sandwiches did you makd? 2) What is the mass of the ...

*Saturday, October 29, 2016 by Lisa*

**Physics**

A Bomber On A Military Mission Is Flying Horizontaly At A Height Of 3000m above the ground at 60km/min,it drops a bomb on a target on the ground,determine the acute angle between the vertical and the line joining the bomber and the target at the instant the bomb is released

*Saturday, October 29, 2016 by Ola*

**physics**

A variable-speed drill, initially turning at 150 rpm, speeds up to 1300 rpm in a time interval of 1.0 s. What is its average rotational acceleration? ----- rpm/s2

*Saturday, October 29, 2016 by Carly D*

**Physics**

A balloon is filled with a gas which is lighter than air.it is observed to rise in a air upto a certain height. State a reason why the balloon stops rising.

*Saturday, October 29, 2016 by Aliy*

**Physics**

State the reason why a steel sphere resting on a horizontal surface is said to be in neutral equilibrium.

*Saturday, October 29, 2016 by Aliy*

**Physics**

The wheels of a skateboard roll without slipping as it accelerates at 0.45 m/s2 down an 75-m-long hill. If the skateboarder travels at 1.8 m/s at the top of the hill, what is the average angular speed of the 2.6-cm-radius whe els during the entire trip down the hill? I first ...

*Saturday, October 29, 2016 by Anonymous*

**physics**

Calculate the magnitude of the force FM required of the "deltoid" muscle to hold up the outstretched arm shown in the figure below. The total mass of the arm is 2.8 kg and θ = 11Â°. d=12cm D=24cm

*Saturday, October 29, 2016 by Rpbert*

**Physics**

A wire with cross sectional area 1.00 cm2 stretches 0.500% of its length when it is stretched with a tension of 20.0 N. What is the Young's modulus of this wire?

*Friday, October 28, 2016 by Rick*

**physics**

Children slide down a frictionless water slide that ends at a height of 1.80 m above the pool. If a child starts from rest at point A and lands in the water at point B, a horizontal distance L = 2.46 m from the base of the slide, determine the height h of the water slide.

*Friday, October 28, 2016 by Amy*

**Physics**

A square metal plate with length L= 0.14 m on each side is pivoted about an axis through the center point O, perpendicular to the plate. Calculate the net torque about this axis due to the three forces shown that act at the corners, with magnitudes F1 =18 N, F2 = 28 N, and F3...

*Friday, October 28, 2016 by Anonymous*

**Physics**

A rigid rod of mass 0.2 kg and length 1.5 m is suspended by wires at each end. The wireshave equal rest length. The wire on the left end of the rod has Youngâ€™s modulus4*10^11Pa, while the one on the right end has Youngâ€™s modulus2*10^11Pa. A ...

*Friday, October 28, 2016 by Anonymous*

**Physics **

Three children are riding on the edge of a merryâ€“goâ€“round that is 84 kg, has a 1.40â€“m radius, and is spinning at 20.0 rpm. The children have masses of 21.0, 24.0, and 29.0 kg. If the child who has a mass of 24.0 kg ...

*Friday, October 28, 2016 by Cristina *

**physics**

A child with a mass of 46 kg is riding on a merry-go-round. If the child has a speed of 3 m/s and is located 2.2 m from the center of the merry-go-round, what is the child's angular momentum? ____kg2/s

*Friday, October 28, 2016 by Sue*

**physics**

A variable-speed drill, initially turning at 150 rpm, speeds up to 1300 rpm in a time interval of 1.0 s. What is its average rotational acceleration? ______rpm/s2

*Friday, October 28, 2016 by Sue*

**PHYSICS**

A uniform ladder of length 20.0m and weight 750 N is propped up against a smooth vertical wall with its lower end on a rough horizontal surface. The coefficient of friction between the ladder and this horizontal surface is 0.40. (a) Draw a diagram for the ladder showing all ...

*Friday, October 28, 2016 by urgent help needed*

**PHYSICS**

A ball of mass 0.15kg is dropped from a height of 1.0m onto a flat surface and rebounds to a height of 0.35m. Calculate: (a) The speed of the ball just before the impact, (b) The speed of the ball just after impact, (c) The change of momentum, (d) The force of impact, if the ...

*Friday, October 28, 2016 by urgent help needed*

**Physics**

A ball roll down a hill with a constant acceleration of 20m/s if the ball start from rest. What is it velocity at the end of 4.05

*Friday, October 28, 2016 by Elisha*

**PHYSICS(MCAT)**

an area several km from an electricity generating station requires 120kw power on average the total resistance is line is 0.4 ohm calculate power loss if the transmission is made ata low voltage 240V

*Friday, October 28, 2016 by shehzad*

**Physics**

A car of mass 1000 kg moving with a velocity of 30m/s applies break and stop after 3s. Find the magnitude of retarding force, the distance travelled by the car before it came to rest and the work done by the breaking force.

*Thursday, October 27, 2016 by Priyanshu*

**Physics **

Three children are riding on the edge of a merryâ€“goâ€“round that is 84 kg, has a 1.40â€“m radius, and is spinning at 20.0 rpm. The children have masses of 21.0, 24.0, and 29.0 kg. If the child who has a mass of 24.0 kg ...

*Thursday, October 27, 2016 by Ashley*

**physics **

a car at 54 km\h is 60 km behind a truck traveling at 10 m\s. how long will it take the car to reach the truck?

*Thursday, October 27, 2016 by Zahraa*

**physics **

a car at 54 km\h is 60 km behind a truck traveling at 10 m\s. how long will it take the car to reach the truck?

*Thursday, October 27, 2016 by Zahraa*

**physics**

computer-controlled display screens provide drivers in the Indianapolis 500 with a variety of information about how their cars are performing. for instance, as ac car is going through a turn, a speed of 221 mi/h (98.8m/s) and centripetal acceleration of 3.00g are display. ...

*Thursday, October 27, 2016 by bob*

**Physics**

The block of mass 2.13615 kg has an acceler- ation of 3.7 m/s2 as shown. What is the magnitude of F? Assume the acceleration due to gravity is 9.8 m/s2 and the surface is frictionless. Answer in units of N.

*Thursday, October 27, 2016 by Jessica*

**Physics**

1. Â Â Â Â Compare the slope of the distance vs. time graph to the average of all your velocity values. Are they close? Why or why not? What does the slope of a distance (or displacement) vs. time graph mean? Explain the ...

*Thursday, October 27, 2016 by Kevana*

**physics**

A variable-speed drill, initially turning at 150 rpm, speeds up to 1300 rpm in a time interval of 1.0 s. What is its average rotational acceleration? ______rpm/s2

*Thursday, October 27, 2016 by Sue*

**physics**

A child with a mass of 46 kg is riding on a merry-go-round. If the child has a speed of 3 m/s and is located 2.2 m from the center of the merry-go-round, what is the child's angular momentum? ____kgÂ·m2/s

*Thursday, October 27, 2016 by Sue*

**Physics**

would apppeciate very much is anyone can help me in the below question. thanks. A man runs round a circular track at a constant speed. Would like to know how to drawn locus of the points representing the magnitude â€˜dâ€™ of the displacement of ...

*Thursday, October 27, 2016 by peterlaw*

**Physics**

two blocks (a and b) are in contact on a horizontal frictionless surface. a 60N constant horizontal force is applied to A. the mass of a is 3.0 kg and the mass of b is 15 kg. what is the magnitude of the force of a on b

*Thursday, October 27, 2016 by Jane*

**physics**

If the rotational speed of a CD changes from 550 rpm to 200 rpm as it plays 30 minutes of music, what is the CD's average rotational acceleration?

*Thursday, October 27, 2016 by Katelyn*

**physics**

A frog jumps at 0.6 m/s at an angle of 20 degrees and lands on a level surface. How far does the frog jump?

*Thursday, October 27, 2016 by Camden*

**Physics**

A car is backing up at a rate of 10km/hr. If the driver looks through his rear-view mirror, how fast does a tree, which is behind him, appear to approach him?

*Thursday, October 27, 2016 by Katherine*

**physics**

A ball bounces off the edge of a table at an initial velocity of 1.5 m/s at an angle of 30 degrees above the table, falling to the floor 75 cm below. How long will the ball be in the air?

*Thursday, October 27, 2016 by Camden*

**physics**

What is the rotational speed of the hour hand on a clock?

*Thursday, October 27, 2016 by Marian*

**physics**

A child with a mass of 17 kg sits at a distance of 1 m from the pivot point of a seesaw. Where should a 15 kg child sit to balance the seesaw?

*Thursday, October 27, 2016 by Jessica*

**physics**

Robin is standing terrified at the end of a diving board, which is high above the water. If Robin has a mass of 56 kg and is standing 1.5 m from the board's pivot point, what torque is Robin exerting on the board?

*Thursday, October 27, 2016 by Heather*

**physics**

A 1400 kg car is traveling at 28 m/s around a curve with a radius of 116 m. What is the angular momentum of the car?

*Thursday, October 27, 2016 by Beth*

**Physics**

After skiding down a snow-covered hill on an inner tube, Ashley is coasting across a level snowfield at a constant velocity of +3.4 m/s. Miranda runs after her at a velocity of +4.0 m/s and hops on the inner tube. How fast do the two of them slide across the snow together on ...

*Thursday, October 27, 2016 by BrookeNeed*

**physics**

A two-stage rocket moves in space at a constant velocity of +4890 m/s. The two stages are then separated by a small explosive charge placed between them. Immediately after the explosion the velocity of the 1380-kg upper stage is +5660 m/s. What is the velocity (magnitude and ...

*Thursday, October 27, 2016 by BrookeNeed*

**physics**

A 40.2-kg skater is standing at rest in front of a wall. By pushing against the wall she propels herself backward with a velocity of -1.84 m/s. Her hands are in contact with the wall for 1.17 s. Ignore friction and wind resistance. Find the average force she exerts on the wall...

*Thursday, October 27, 2016 by BrookeNeed*

**physics**

The work that a force does by acting on an object is equal to what? 1) the product of force (in the direction of motion) and distance and is negative if the force and motion are in the same direction 2) the product of force (in the direction of motion) and distance and is ...

*Thursday, October 27, 2016 by Jessica*

**physics**

A railroad car of mass 2.15 ✕ 104 kg moving at 3.15 m/s collides and couples with two coupled railroad cars, each of the same mass as the single car and moving in the same direction at 1.20 m/s. (a) What is the speed of the three coupled cars after the collision? ...

*Thursday, October 27, 2016 by Evette*

**Physics**

You're tour director for a lunar trip, and want to award your passengers with certificates commemorating their crossing the point where the Moon's gravity becomes stronger than Earth's.How far from Earth should you award the certificate? Express your answer in ...

*Thursday, October 27, 2016 by Emma*

**Physics **

How will the elastic potential energy and the gravitational potential energy change at different points in the oscillation?

*Thursday, October 27, 2016 by Kieyara*

**Physics honors**

If a racer runs at an average speed of 7m/a how far will she run in 1 min 45 seconds?

*Thursday, October 27, 2016 by Ayanna*

**Physics**

A uniform ladder of length 20.0m and weight 750 N is propped up against a smooth vertical wall with its lower end on a rough horizontal surface. The coefficient of friction between the ladder and this horizontal surface is 0.40. (a) Draw a diagram for the ladder showing all ...

*Thursday, October 27, 2016 by Valentina*

**Physics **

A ball of mass 0.15kg is dropped from a height of 1.0m onto a flat surface and rebounds to a height of 0.35m. Calculate: (a) The speed of the ball just before the impact, (b) The speed of the ball just after impact, (c) The change of momentum, (d) The force of impact, if the ...

*Thursday, October 27, 2016 by Valentina*

**physics**

In a Broadway performance, an 85.0-kg actor swings from a R = 4.45-m-long cable that is horizontal when he starts. At the bottom of his arc, he picks up his 55.0-kg costar in an inelastic collision. What maximum height do they reach after their upward swing?

*Thursday, October 27, 2016 by Evette*

**physics**

You shoot a 56 gram dart vertically upwards from a catapult with a spring constant of 335 N/m. The catapult is initially stretched from the equilibrium point by 27 cm. What is the height above the starting point reached by the dart?

*Thursday, October 27, 2016 by polo*

**Physics**

A) Under what condition is average velocity equal to instantaneous velocity? B) Does the speedometer of car measure speed or velocity? Explain. C) Can the magnitude of a vector be less than the magnitude of any of its components? Explain.

*Thursday, October 27, 2016 by Amrit*

**Physics**

A) Under what condition is average velocity equal to instantaneous velocity? B) Does the speedometer of car measure speed or velocity? Explain.

*Thursday, October 27, 2016 by Amrit*

**Physics**

Under what condition is average velocity equal to instantaneous velocity?

*Thursday, October 27, 2016 by Amrit*

**Physics**

A stone is thrown from the top of a tower of height 60m with velocity 40m/s at an angle of 30 degree above the horizontal. Calculatethe time taken by the stone to hit the ground. At what distance from the foot of the tower the stone hits the ground.

*Thursday, October 27, 2016 by Swasthi *

**Physics**

A man walking on a road at 3km/hr encounters rain falling vertically at 18km/hr. At what angle should he hold the umbrella to protect himself from rain?

*Thursday, October 27, 2016 by Alisha*

**Physics**

You toss a ball from your window 8m above the groun. When the ball leaves your hand, ut is moving at 10m/s at an angle of 20 degree below the horizontal. How far horizontally from your window will the ball hit the ground? Ignore air resistance. Plz answer it fast . It's my...

*Thursday, October 27, 2016 by Alisha*

**Physics**

A river flows from south to north at 5km/hr. On this river a boat is heading east to west perpendicular to the current at 7km/hr. As viewed by an eagle hovering at rest over the shore, how fast and in what direction is the boat travelling?

*Thursday, October 27, 2016 by Alisha*