# Homework Help: Science: Physics

## Recent Homework Questions About Physics

**physics**

a particle is projected horizontally at 15m/s from a height of 20m calculate the horizontal distance covered by the particle just before hitting the ground (g=10m/s*2)

**physics**

A particle is drop from a vertical height (h) and falls freely for a time (t) with the aid of a sketch explain how (h) varies with (i) t (ii) t*2

**physics**

Two identical boxcars (m = 14866 kg) are traveling along the same track but in opposite directions. Both boxcars have a speed of 5 m/s. If the cars collide and couple together, what will be the final speed of the pair?

**physics**

A particle is drop from a vertical height (h) and falls freely for a time(t) with the aid of a sketch explain how (h) varies with (I) t (ii) t square

**physics**

a particle is projected horizontally at 15m/s from a height of 20m calculate the horizontal distance covered by the particle just before hitting the ground (g=10m/s square)

**physics**

You have a mass of 84 kg. How fast (in mph) would you have to run to have the same momentum as an 18-wheeler (m = 28,000 kg) rolling along at 1 mph

**physics**

If the momentum of one object changes in a system that is subject to no net external force, what else must happen? 1) Collisions with other objects will change its momentum back. 2) The momenta of the other objects in that system change in the same way. 3) The momenta of the ...

**physics**

two forces with magnitude of 25N and 18N respectively are inclined at an angle of 120degree to each other. calculate the resultant force and the angle it makes with the 18N force.

**physics**

A 63 kg child descends a slide 7.6 m high and reaches the bottom with a speed of 3.20 m/s. How much thermal energy (in joules) due to friction was generated in this process?

**physics**

A 550 N crate rests on the floor. How much work in joules is required to move it at constant speed 7.0 m along the floor, against a friction force of 150 N?

**Physics**

a wrecking ball weighing 2500 N hangs from a cable. Prior to swinging, it is pulled back to a 20 angle by a second, horizontal cable. What is the tension in the horizontal cable? We recently started these problems, and I still am so lost with them. Sorry about the lack of work...

**Physics**

A stone thrown upward to just reach the top of a palm tree that is 8.2m tall. Calculate the initial speed that is require

**Physics (Mechanics)**

Two blocks with equal masses m1 = m2 3.2 kg are connected via a pulley as shown in the above figure. Take the coefficent of kinetic friction to be 0.3 and the angle of the incline to be 40 degrees. Find the acceleration given that (Note: enter a negative value if the ...

**Physics (Mechanics)**

A block of mass m1 hangs vertically and is attached by a string to a block of mass m2 on a frictionless slope inclined at angle theta to the horizontal, as shown above. If m1 = 2.5 kg, it accelerates at -0.108 m/s2. If m1 = 0.8 kg, it accelerates at 2.888 m/s2. Determine the ...

**physics**

A cannon fires a shell straight upward; 1.7 s after it is launched, the shell is moving upward with a speed of 19 m/s. Assuming air resistance is negligible, find the speed (magnitude of velocity) of the shell at launch and 5.4 s after the launch.

**physics**

You toss a tennis ball straight upward. At the moment it leaves your hand it is at a height of 1.5 m above the ground, and it is moving at a speed of 6.4 m/s.When the tennis ball is at a height of 2.2 m above the ground, what is its speed?

**Physics**

A 2260kg truck drives East with a constant velocity of 18m/s. It comes to a stop after traveling 123m. What is the noraml force exerted by the road on the truck? Also, is the distance travelled essential to solve the problem or is unnecessary information?

**Physics**

An object has a mass of 100 lb is projected from the ground level in the air at an angle of 60 degrees with the horizontal direction with a velocity of 72 km/hr. What is the projection velocity in m/s ?

**Physics**

1+2=

**PHYSICS**

Two balls of identical sizes but different masses moving exactly along the same straight line. The left ball (m = 0.5 kg) is moving with a velocity of 2 m/s to the right, and the right ball (m = 0.1 kg) is moving at 0.25 m/s to the right also. The balls collide. After the ...

**physics**

A rotating wheel requires 7.00 s to rotate 28.0 revolutions. Its angular velocity at the end of the 7.00-s interval is 97.0 rad/s. What is the constant angular acceleration (in rad/s) of the wheel? rad/s2

**PHYSICS**

On a windless day, a sailor (m = 75 kg) decides he wants to go sailing in his sailboat (m = 300 kg). In order to move on this windless day, he decides to mount a powerful battery-operated fan (m = 20 kg) on the back of his sailboat and ponits the running fan at the sail. The ...

**university physics 2**

three crates are connected by a string and pulley system. The mass of the crate hanging on the left side of the table is 0.820 kg and the mass of the crate on the table is 1.78 kg. If the coefficient of kinetic friction between the table and the 1.78 kg crate is 0.570, what is...

**university physics**

there is a crate of mass 4.67 kg on top of another crate of mass 2.29 kg. The coefficient of friction between the lower crate and the floor is μk = 0.280 and the coefficient of static friction between the two crates is μs = 0.820. If the crates start at rest and a ...

**Physics**

A child saw a skunk in a hole of a tree, standing 2.5m away. The child attempted to throw a pebble into the hole, but missed with a speed of 11m/s. Angle of elevation is 75 degrees, what was the Vfy of the pebble?

**Physics**

A girl tried to overthrow gender stereotypes by kicking her stuffed animal across a park with an initial velocity of 25m/s, making an angle of 45 degrees with the horizontal. Upon reaching maximum height, her cat jumped and propelled it further horizontally with a velocity of ...

**physics**

An object of mass 2 kg is dropped from a certain height. On rebounding from the ground, it rises vertically till 2 th 5 of its initial height. The ratio of magnitude of momentum of the object just before and after striking the ground is

**Physics**

A car starts from rest and travels for 10 seconds with a constant acceleration of 3.0 m s^-2. The driver then applies the brakes causing a negative acceleration of -4.0 m s^-2. Assuming that the brakes are applied for 2.0 seconds, calculate, a) the velocity of the car at the ...

**Physics**

A cricket ball is thrown at a speed of 30ms^-1 in a direction 30 degrees above the horizontal. Calculate: 1. The maximum height. 2. The time taken to return to the same level. 3. The distance from the thrower to where the ball returns to the same level.

**Physics**

A car of mass 1000kg is travelling along a straight flat road at a constant speed of 30.0ms^-1. It then accelerates with constant acceleration of 3.00ms^-2 for 10.0s, after which it continues to travels at a constant speed. Determine: (a) The final speed of the car (b) The ...

**physics**

Which of the following statements is false regarding the ‘drift’ of charge carriers?

**Physics**

A girl throw a ball with initial velocity V at an inclination of 45° .The ball strikes the smooth vertical wall at a horizontal distance d from the girl & after rebounding returns to her hand .What is the coefficient oof resitution between wall & the ball

**Physics fundamentals**

When a crate is moving on a track where friction is not negligible. The friction force is said to be kinetic friction static friction Non existant

**physics**

If 1000 electrons are removed from an isolated neutral metal sphere, calculate the charge acquired by the sphere. -1 mark question of state syllabus.

**Physics**

How much power is required to move a 1500 kg elevator at a constant velocity of 2.5m/s.

**Physics**

A) An object with mass M=10kg is held on a incline. The object and the incline surfaces have a static friction coefficient of 0.3. What is the maximum angle at which the object starts moving? B) Again, suppose that the force in A) is a push applied horizontally on the mass ...

**Physics**

A 1.55 m tall person lifts a 1.80 kg book off the ground so it is 1.95 m above the ground. A.) What is the potential energy of the book relative to the ground? B.) What is the potential energy of the book relative to the top of the person's head?

**Physics**

A girl jumps off a platform with a horizontal velocity of 2.06 m/s and lands in the water 1.3 s later. Gravity is 9.8m/s^2. How high is the platform.

**Physics**

Circular motion: Not sure if I did this right. I need to find the speed that a spaceship needs to rotate to create an artificial gravity of 9.8m/s^2 (at feet) r=10m a=V^2/r 9.8=v^2/r root of(9.8*10)=v v=9.9m/s is this close?

**Physics 11 URGENT STEVE OR BOB OR ANY PHYSICS Guys**

An 42 kmph wind blows towards 215 degrees while a plane heads towards 125 degrees at 152kmph. What is the resultant velocity of the plane? tenks vry much!!!!!!!!!!!!!!!!!!!

**Physics**

On a windless day, a sailor (m=75kg) decides he wants to go sailing (=300kg). In order to move on this windless day, he decides to mount a powerful battery operated fan )m=(20 kg) on the back of his sailboat and points the running fan at the sail. The fan can deliver air that ...

**Physics**

If someone pushes on a box on a horizontal floor with a horizontal force of 17.8 N, but the box does not move, what is the static friction (Fs) between the box and the floor? Explain. The next question is: If the box just starts to move with a horizontal force of 29.5 N, what ...

**Physics**

An object of mass 10kg is placed on an inclined plane at 30 degree to the horizontal. Calculate the reaction between two surface and what is the coefficient of static friction.

**Physics**

A 46−N lithograph is supported by two wires. One wire makes a 28° angle with the vertical and the other makes a 16° angle with the vertical. Find the tension in each wire.

**Physics**

5. You are hiking in a canyon and you notice an echo. You decide to let put a yell and notice it took 2 seconds before you heard the echo of your yell. How far away is the canyon wall that reflected your yell?

**physics**

The speed of sound in air is 350m/sec the frequency of the fundamental node emitted by tube length 50cm open one end is:

**Physics**

If someone pushes on a box on a horizontal floor with a horizontal force of 17.8 N, but the box does not move, what is the static friction (Fs) between the box and the floor? Explain. The next question is: If the box just starts to move with a horizontal force of 29.5 N, what ...

**PHYSICS**

Explain for each of the following, The Magnus force applies and how it causes an effect. a. A car tire rotating while a car drives. b. A tennis ball curves while moving towards the opposite side of the net. c. A tennis ball changes directions when it hits the ground. d. A ...

**Physics**

a 1 kg textbook has been pushed and let go sliding to the left on a flat table no one is pushing the book at this moment. it is sliding a. calculate the weight of the textbook? How do I do these calculations? b. based on this weight, what must the normal force from the table ...

**Physics**

pressure is force per area in a high wind the increased pressure inside of a skyscraper can be up to 29 lbs/ft2. calculate the wind load in pounds on the windward side of a 150 ft wide, 850 ft tall building. How much is this in newtons?

**Physics**

A red ball is thrown straight up from the edge of the roof of the building. A green ball is dropped from the same point 1.80 seconds later.a)if the height is 60.0 m, what is u(red)?b)if u(red) greater than u(max) determine u(max). Ive solved abut i cannot understand b, please ...

**Physics Force and Friction question**

A crate of mass 100kg is at rest on a horizontal floor. The coefficient of static friction between the crate and the floor is 0.4, and the coefficient of kinetic friction is 0.3. A horizontal force, F, or magnitude 350N is applied to the crate. Which of the following is true? ...

**Physics**

A 75.0 kg object is on an incline of 30 degrees horizontally. I have to calculate several things from this, and I need help with some of them. I have to find the following: 1. Static coefficient of friction 2. Kinetic coefficient of friction 3. Gravitational force 4. Normal ...

**physics**

A stone is thrown vertically upward with a velocity of 58 ft./sec. A.) How high will it rise? B.) How soon will it reach the ground again? C.) What is its velocity half-way up?

**Physics**

A satellite orbits the moon at height of 2000m.assuming it to gravitational pull of the moon,find the speed and time it takes for one orbit,given that mass of moon is 7.34 * 10 to power 22 kg and radius is 1.738 * 10 to power 6m.(g = 6.6 * 10 to power -11nm2/kg).

**dinesh physics**

a car start from rest and sccelerates uniformly at 2 ms-2 for 10s what is its velocity at the end of 10s

**physics**

A car travelled 7km40degree west of north and then 10km east.what is the resultant displacement using scale drawing

**Physics**

A superhero flies 185 m from the top of a tall building at an angle of 15◦ below the horizontal. What is the horizontal component of the superhero’s displacement? Draw the vectors to scale on a graph to determine the answer. Answer in units of m. Your answer must be ...

**Physics**

A truck travels beneath an airplane that is moving 150 km/h at an angle of 34◦ to the ground. How fast must the truck travel to stay beneath the airplane? Answer in units of km/h.

**Physics**

What is the direction of this resultant vector (between the limits of −180◦ and +180◦ from the positive x-axis) ? 1. −88◦ 2. −117◦ 3. −144◦ 4. −143◦ 5. −135◦ 6. −171◦

**Physics**

Consider two vectors F~1 with magnitude 69 N inclined at 177◦ and F~2 with magnitude 58 N inclined at 286◦, measured from the positive x axis with counterclockwise positive. What is the magnitude of the resultant vector F~1 + F~2 ? Draw the vectors to scale on a ...

**Physics**

A person walks 21 m East and then walks 34 m at an angle 32◦ North of East. What is the magnitude of the total displacement? Answer in units of m.

**physics**

The system shown below are in equilibrium with m = 2.90 kg If the spring scales are calibrated in newtons, what do they read? Ignore the masses of the pulleys and strings and assume the pulleys and the incline are frictionless. Image: imgur. com/a/GCJIL

**Physics**

A boy pushes a box of mass 20kg with a for every of 50N.What is the acceleration of the box

**Physics**

A boy starts with initial speed u and mouse in a straight line with constant acceleration it has been be after covering a distance 2S its speed just after covering distance s is

**physics**

A body is thrown at an angle 30 to the horizontal with the velocity of 30m/s.After 1 second,its velocity will be

**Physics**

A heat engine operating between a cold reservoir temperature of 300K and a hot reservoir takes 200J of heat from the hot reservoir and delivers 120J of heat to the cold reservoir in a cycle. The minimum temperature of the hot reservoir is :

**Physics**

A projectile is launched horizontally from a cliff and has initial speed 30 m/s. The projectile will hit the ground 10 s later. What is the horizontal component of the projectile's velocity 5.0 s after launch. Assume air resistance is negligible.

**physics**

The wavelength of first line of balmer series in hydrogen spectrum is 6563 A. Find the wavelength of first line of lyman series in the same spectrum.

**Physics**

A thin convex lens produce a real image on an a screen . if an object of height 36mm is placed 2000mm from the screen ,an image of height 684mm will be produced .determine A) the distance of the object from the lens B) the focal length of the lens

**Physics**

the mass of an empty density bottle is 4og and 5og when filled with liquid x.calculate the density of liquid x when dem

**Physics**

You are in an elevator that is accelerating upwards at 2m/s^2. If your mass is 70kg, what is the normal force pushing on you by the floor of the elevator? A. 70N B. 690N C. 830N Please give the correct answer and an explanation as to why its correct.

**Physics**

A crate of mass 100kg is at rest on a horizontal floor. The coefficient of static friction between the crate and the floor is 0.4, and the coefficient of kinetic friction is 0.3. A horizontal force, F, or magnitude 350N is applied to the crate. Which of the following is true? ...

**Physics**

Multiple Choice. If all of the forces acting on an object an object are balanced (net force is zero), then: a. The object's speed will decrease b. The object's direction of motion can change, but its speed cannot C. The object is ecperiencing zero acceleration Please explain ...

**Physics**

Why is the joule-second (J*s) equivalent to kg*m^2/s ?

**physics**

Starting from rest, a 93-kg firefighter slides down a fire pole. The average frictional force everted on him by the pole has a magnitude of 710 N, and his speed at the bottom of the pole is 3.2 m/s. How far did he slide down the pole? What equation do you use to determine this.

**physics**

A 50.4-g golf ball is driven from the tee with an initial speed of 45.7 m/s and rises to a height of 26.9 m. (a) Neglect air resistance and determine the kinetic energy of the ball at its highest point. (b) What is its speed when it is 7.80 m below its highest point?

**Physics**

I have a picture of one person pushing a boulder with 60 N and another person pushing from the same side at 90 N. The friction of the boulder is 40 N. The question asks to find the total force on the boulder. Is "total force" just the net force in this case or something ...

**Physics**

Block B has a mass of 4.50kg and is moving to the left at a speed of 4.50m/s. Block A has a mass of 6.50kg and is moving to the right. The two blocks undergo a perfectly inelastic collision. What should the velocity of the Block A be in order to have the two blocks move to the...

**Physics**

The 500 kg video display will be raised to its position 20 m above the arena floor by a motorized winch powered by a 12 volt battery. If the battery capacity is 100 A-hr and the system is 100% efficient, how many times could the display be lifted into position before the ...

**Physics**

A bowling ball rolls off the edge of a giant' table at 18 m/s. If it takes 6 s for the ball to hit the ground. A) How far does it land from the base of the table? B) how far does it fall?

**Physics**

A rock is thrown off a cliff with a vertical speed of 53 m/s upward and a horizontal speed of 30 m/s. A) what will these speeds Vx and Vy, be 4 seconds later? B) what will be the x and y displacements of the rock be 4 seconds later?

**Physics**

Al the astronaut has a weight of 1600 N when he is standing on the surface of earth. What is the force of gravity action on him when he is in space station orbiting earth at a distance of four earth radii from the center of the earth?

**Physics**

Angela and Paul are opposite ends of the 4.0 m long bar. Paul, whose mass is 78 kg feels attraction to Angela, whose mass is 55 kg. A: If the attraction is gravitational, how strong, in Newtons, is it? B: What are their individual weights?

**physics**

"Rocket Man" has a propulsion unit strapped to his back. He starts from rest on the ground, fires the unit, and accelerates straight upward. At a height of 16 m, his speed is 5.5 m/s. His mass, including the propulsion unit, has the approximately constant value of 139 kg. Find...

**Physics**

Starting from rest, a 1.7x10-4 kg flea springs straight upward. While the flea is pushing off from the ground, the ground exerts an average upward force of 0.45 N on it. This force does 1.9x10-4 J of work on the flea. (a) What is the flea's speed when it leaves the ground? (b...

**physics**

The concepts in this problem are similar to those in Multiple-Concept Example 4, except that the force doing the work in this problem is the tension in the cable. A rescue helicopter lifts a 89.2-kg person straight up by means of a cable. The person has an upward acceleration ...

**Physics**

A rock is thrown off a cliff with a vertical speed of 53 m/s upward and a horizontal speed of 30 m/s. A) what will these speeds Vx and Vy be 4 second later? B) what will be the x and y displacements of the rock be 4 second later?

**Physics**

A cyclist whose mass is 48 kg turns a corner with a radius of 30 m at a speed of 25 m/s. A) What is the magnitude of the cyclist's acceleration? B) what is the magnitude of the force action on the cyclist?

**physics**

What is the minimum work in joules needed to push a 1210 kg car 54.0 m up a 12.5 degree incline? (Ignore friction.)

**Physics**

Please show me how to work the following problems. 1) A cyclist whose mass is 48 kg turns a corner with a radius of 30 m at a speed of 25 m/s. A) What is the magnitude of the cyclist's acceleration? B) What is the magnitude of the net force acting on the cyclist? 2) A rock is ...

**physics**

A spring whose spring constant is 450 N/m is compressed 0.800 m. What speed (in meters/second) can it give to a 0.500 kg ball when released?

**Physics, ray optics**

An astronomical telescope of magnifying power 7, consist of two thin lenses 40 cm apart in normal adjustment. Find the focal length of the lenses.

**physics**

Two boxes are connected by a weightless cord running over a very light frictionless pulley as shown in the figure. Box A, of mass 8.0 kg, is initially at rest on the top of the table. The coefficient of kinetic friction between box A and the table is 0.10. Box B has a mass of ...

**Physics**

A man chased by the army, leaps with speed 12 m/s at a 47 degree angle above the horizontal from the top of a building. If he lands 40.0 m from the base of the building, then finds the height of the building

**Physics**

What is the centripetal acceleration of an automobile driving at 40 km/h on a circular track of radius 20m? Help ASAP please!!!

**Physics**

A mover finds that a 20 kg crate initially at rest requires a 75 N horizontal force to set the crate in motion, but only a 60 N force to maintain a constant velocity. Find a) the co-efficient of static friction between crate and floor. b) the co-efficient of kinetic friction ...

**Physics**

A plane leaves Seattle, flies 77.0 mi at 21.0 ∘ north of east, and then changes direction to 52.0 ∘ south of east. After flying at 124 mi in this new direction, the pilot must make an emergency landing on a field. The Seattle airport facility dispatches a rescue ...

**Physics**

If you jumped off a 25 meter cliff on the moon (gravity being 1.66) what would be a comparable hight of that cliff on earth? the answer and show me how to get it.

**physics**

A stone is thrown vertically upward at 23 m/s. How fast is it moving when it reaches 14 m?