# Homework Help: Science: Physics

## Recent Homework Questions About Physics

**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 ...

**Quick Physics Question**

Are both linear and angular momentum conserved in static equilibrium ?

**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?

**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 ...

**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?

**Physics**

William Tell must split the apple atop his son’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

**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 ...

**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?

**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?

**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 27.0° with respect to the ground. Treat the ball as a thin-walled spherical shell (I = ⅔mr²), and determine the range...

**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

**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 ...

**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 ...

**physics**

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

**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 ...

**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.

**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 ...

**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

**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 ...

**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.

**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 ...

**physics**

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

**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 ...

**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 ...

**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 ...

**physics**

A volume of 140 cm3 of an ideal gas has an initial temperature of 20°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 40°C?

**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...

**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 ...

**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?

**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 ...

**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

**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

**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.

**Physics**

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

**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 ...

**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 = 11°. d=12cm D=24cm

**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?

**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.

**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...

**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 Young’s modulus4*10^11Pa, while the one on the right end has Young’s modulus2*10^11Pa. A 2 kg mass is hung fromthe beam. ...

**Physics**

Three children are riding on the edge of a merry–go–round that is 84 kg, has a 1.40–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 moves to the center of the merry–go–round, what is ...

**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

**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

**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 ...

**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 ...

**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

**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

**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.

**Physics**

Three children are riding on the edge of a merry–go–round that is 84 kg, has a 1.40–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 moves to the center of the merry–go–round, what is ...

**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?

**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?

**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. ...

**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.

**Physics**

1. 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 answer using your data.

**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

**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? ____kg·m2/s

**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 ‘d’ of the displacement of the man from the starting ...

**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

**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?

**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?

**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?

**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?

**physics**

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

**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?

**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?

**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?

**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 ...

**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 ...

**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...

**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 ...

**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? ...

**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 meters.Express ...

**Physics**

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

**Physics honors**

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

**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 ...

**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 ...

**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?

**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?

**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.

**Physics**

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

**Physics**

Under what condition is average velocity equal to instantaneous velocity?

**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.

**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?

**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 ...

**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?

**physics**

If the effect of the air resistance acting on falling raindrops is ignored, then we can treat raindrops as freely falling objects. a.) Rain clouds are typically a few hundred meters above the ground. Estimate the speed with which raindrops m/s, km/hr, and mi/hr? b.) From your ...

**physics**

A uniform vertical glass tube open at the lower end and sealed at the lower end is lowered into sea water thus trappung the air int he tube . It is observed that when the tube is submerged to a depth 10 meters the sea water has entered the lower half of the tube . To what ...

**physics**

Calculate the component of a force of 200N at a direction of 60degre to the force

**Physics**

A bullet is fired with an initial speed of 200 m/s. If a target is 500ft away, at what angle should the rifle be raised in order to hit the target?

**Physics**

A point mass block slides without friction on the loop-de-loop track of radius R as shown. From what height h must it be released from rest in order to make it around the loop without leaving the track? Show the equation and then plug the numbers into that equation and show ...

**Physics**

Two identical massless springs of constant k = 200N/m are fixed at opposite ends of a level track, as shown. A 5 kg block is pressed against the left spring, compressing it by 0.15m. The block is then released from rest. The entire track is frictionless except for the region ...

**Physics**

How much work must be performed by a hand or other such agent to move the 8kg block very slowly 10 cm to the right if the attached spring was initally relaxed? Let k = 200 N/m and mK = 0.5. Show the equation and the plug the numbers into the equation and then the answer at the...

**Physics**

A 3 kg object initially at rest is acted on by a non-constant force which causes it to move 3 m. The force varies with position as shown in the figure. a) How much work is done on the object by this force? b) What is the final speed of the object as it arrives at x=3m? Assume ...

**Science-physics**

A bottle weighs 35g when empty,95g when filled with water and 119g when filled with an organic liquid. What is the capacity of the bottle: A-60cm cube B-84cm cube C-130cm cube D-154cm cube

**physics**

Sam and Sue are running side by side in a marathon. They are running at a constant velocity of 10 km h . What is Sue's relative velocity to Sam? A) 0 km/h B) 5 km/h C) 10 km/h D) 20 km/h

**Physics**

A 150 kg body is at rest and covers the constant force needed to impart a velocity of 8m/s to it in 5s.

**Physics**

A ball of mass 8 kg moving with a speed of 2m/s and rebounds with the same speed.Determine the impulse experienced by the ball. (a)20.0kg/m (b)10.0kg/m (c)0.01kg/m (d)1.3kg/m

**Physics**

A ball of mass 8 kg moving with a speed of 2m/s and rebounds with the same speed.Determine the impulse experienced by the ball.

**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 ...

**Physics**

Since moment of inertia is a scalar quantity, a compound object made up of several objects joined together has a moment of inertia which is the scalar sum of the individual moments of inertia. A) A wooden cylinder has mass m and radius R. To be used as a machine part, its ...