# Homework Help: Science: Physics

## Recent Homework Questions About Physics

**physics**

Two arrows are fired simultaneously with the same speed of 30.0 m/s. Each arrow has a mass of 0.100 kg. One is fired due east and the other due south. What is the magnitude of the total momentum of this two-arrow system?

**physics**

A 53.8-kg skater is standing at rest in front of a wall. By pushing against the wall she propels herself backward with a velocity of -1.33 m/s. Her hands are in contact with the wall for 0.960 s. Ignore friction and wind resistance. Find the average force she exerts on the ...

**physics**

The hail comes straight down at a mass rate of m/Δt=0.0690 kg/s and an initial velocity of v0= -15.0 m/s. Suppose that the hail described there bounces off the roof of the car with a velocity of +14.0 m/s. Ignoring the weight of the hailstones, calculate the magnitude of the ...

**Physics**

An auditorium measures 43.0m × 18.0m × 15.0m. The density of air is 1.20 kg/m3. What is the volume of the room in cubic feet? (Do not input units. Note that 1m = 3.28ft) My Answer 43x18x15 = 11,610 m^3 11,610m3 * 3.28ft m = 38,080.8 ft When I used this number I got it ...

**Physics**

The picture shows a two-dimensional free body diagram of a truss with a pin joint at one end. The free body diagram at the pin joint should show: a. no forces at the joint b. only parallel force component c. only perpendicular force component d. both parallel and force ...

**Physics**

Newton's laws of motion work best for objects under which conditions. a. very slow and fast moving. b. very large and slow moving. c. very small and slow moving. d. very large and fast moving.

**Physics**

A father and son were both pulling a red wagon at a magnitude of 61 lbs. at 139 degrees . The son pulled at a magnitude of 22 lbs. What was the magnitude of the fathers force ( component vector ?

**Physics**

Based on the data from both experiments, predict how the angle of slip might change as the weight of the block increases. a. The angle of slip has no correlation to the weight of the block b. As the weight of the block increases, the angle of slip will decrease c. As the ...

**Physics- Magnetic Field inside of coil**

Current flows through the wire coil in the direction shown by the arrows. What is the direction of the magnetic field inside the coil? (Image shows arrow pointing up into the right side of the coil and pointing down at the left side of the coil) a. upward b. downward c. toward...

**Physics- Free Body Diagram; Truss with Pin Joint**

The picture shows a two-dimensional free body diagram of a truss with a pin joint at one end. The free body diagram at the pin joint should show a. no forces at the joint b. only parallel force component c. only perpendicular force component d. both parallel and force components

**Physics- Newton's Laws of Motion Works Best When?**

Newton's laws of motion work best for objects under which conditions. a. very slow and fast moving. b. very large and slow moving. c. very small and slow moving. d. very large and fast moving.

**physics**

Find the power delivered to an element at t=3 ms if the current entering its positive terminal is i=5cos60πt A and the voltage is V=3 di/dt

**physics**

determine the velocity of a charge that push by the 16 volts source

**physics**

Hello, could anyone help with this excersise of Harmonic Motion? I have to show that a block of mass "m" that is attached at the top of a frictionless inclined plane using a string of "k" constant , performs simple harmonic motion... Well doing the the addition of forces that ...

**Physics**

Time taken by an object falling from rest to cover the heights of h1and h2 are respectively t1 and t2.then the ratios of t1 and t2 is

**science(physics)**

Why a minibus is more likely to topple over when the roof rack is heavily loaded than when the roof rack is empty?

**physics**

Place a coin on top of a sheet of paper on a desk or table. Pull the paper horizontally with a quick snap. What concept of physics does this illustrate?

**Physics**

A stone of mass 50g is accelerated from a catapult to a speed of 8.0 ms-1 from rest over a distance of 30 cm. What average force is applied by the rubber of the catapult ?

**Physics**

What is the acceleration of an elevator if the mass of the elevator and occupants is 1200 kg and the tension in the cable is 10000 N? Which direction is the elevator going?

**physics**

a 5cm bulet move 500ms^1 Penetrates 5cm wood and stop find time of stop

**physics**

The mass of the Earth is 5.98 × 1024 kg. A 6.83 kg bowling ball initially at rest is dropped from a height of 2.12 m. The acceleration of gravity is 9.8 m/s^2. What is the speed of the Earth coming up to meet the ball just before the ball hits the ground? How do you solve this?

**math sets**

out of 320 students at a university,190 taking math,235 taking chemistry and 120 taking physics.125 are taking both chemistry and math,95 taking both chemistry AND PHYSIC,55 TAKING BOTH MATH AND PHYSICS.HOW MANY ARE TAKING ALL THE THREE SUBJECTS

**maths/physics help**

A skate dancer spins about a vertical axis at 1rev/s with arms out Stretched.with her arms folded,her moment of inertia about the vertical axis decreased by 60%,Calculate the rate of revolution... Plz show step

**physics**

A pilot of an aeroplane flying at 300km\hr wishes to release a package of mail at the right position so that it hits the spot. What angle (theta) should his line of sight to the target make the instant of release at 150 metre.

**physics**

A ball rolls of the top of stairway with a horizontal speed of 1.5m\s. The steps are 0.5 metre high and 0.5 metre wide. Which step will the ball hit first?

**physics**

A rifle with muzzle velocity of 460m\s shoot a bullet at small target 46 metre away. How high above the target must the gun be aimed so that the bullet will hit the target.

**Physics**

QUESTION: A car goes around a circular track with a radius of 1000 m at a constant speed of 10 m/s. (a) How long does it take the car to go once completely around the track? (b) What is the average velocity of the car over this time interval? WORK: What I did for (a) t= d/s (...

**Physics**

A 0.075-kilogram dart strikes a 2-kilogram stationary block of wood. If the dart sticks in the wood and the dart and wood fly off together at 1.5 meters per second, what was the approximate original speed of the dart?

**Physics, Science**

How would the length of a day be affected if all the world’s inhabitants continuously walked in an easterly direction? When they stopped walking?

**physics**

a motor car of mass 800kg travelling at 20m/s is brought to rest by breakes in 100m.calculate the average breaking force required.in physics

**Physics**

A skateboarder with a mass of 68.6 kg and a speed of 4.92 m/s coasts across a parking lot. After coasting for 35.0 m the skateboarder has a speed of 1.12 m/s. How much work has been done against friction? a) 338 J b) 76.8 J c) 7.5 J d) 787 J

**Physics**

A constant 5 N horizontal force hits a stationary 2 kg ball. What is the balls speed after going 10 m?

**physics**

wht is defference bn force ,power&energy

**physics**

Two motorcycles are at rest and are separated by 24 ft they start at the same time and same direction , the one in the back is having acceleration 3 ft/ sec^2 and the one in front is 2 ft/sec^2 can be machine at the back overtake in front? A. How long thus it takes to overtake...

**physics**

Abody moves along astraight line from A-B wiz uniform acceleration 2/3ms velocity at B is 25m/s.find velocity at A.find distance A-B.

**Physics**

The rear window in a car is approximately a rectangle, 2.0 m wide and 0.37 m high. The inside rearview mirror is 0.52 m from the driver's eyes, and 1.38 m from the rear window. a) What is the minimum length for the rearview mirror if the driver is to be able to see the entire ...

**physics**

Show that the period ( time for one complete swing back wards and for wards of a pendulum T=√L(costeta)/g is only true for small angle almost less than one radian.

**physics**

What is the initial angle 0f projection of a projectile for which the range and the maximum height are equal?

**physics**

A particle (p) moves along the curved surface (s). Show that p will remain in contact with s provided that at all times its speed v≥√rgcosteta.

**physics**

The initial velocity of a projectile is 12i+13j in m\s. What is the displacement of a projectile at 0.25 seconds later?

**physics**

When I was traveling at 18m/s with my bike I approach traffic lights when I was 30m far from them they turned red and it took me to recognize and react by applying breaks then I decelerated to 4.6m/s2. How will I go and in which side of the traffic lights?

**physics**

Find the limiting velocity of a rain drop assuming diameter of 5.0×10^-4m.The density of air relative to water is 1.3×10^-3

**Physics**

the engineer of a passenger train traveling at 100 ft/sec sights a freight train whose caboose is 600 ft ahead of the same track. The freight train is traveling in the same direction as the passenger train with a velocity of 30 ft/sec. The engineer of the passenger train ...

**AP Physics 1**

A 1400 kg car is moving westward with a speed of 12 m/s, and a 3600 kg truck is traveling east with a speed of 27 m/s. Find the velocity of the center of mass of the system. Answer in units of m/sˆ

**Physics**

These are Thermodynamics questions: There is a 7 kg piece of aluminum at 80°C placed in a 3 kg water at 20°C what is the final temperature? There is a piece of aluminum at 90°C placed in 2 kg of water at 35°C how much energy is transferred if the final temperature is 45? ...

**physics**

a skateboarder with mass 75 kg is riding their skateboard of mass 8 kg at 1.5 m/s. If they decide to jump off sp that their body has no horizontal movement in the air before landing, how fast must the skateboard be moving after they separate

**physics**

A car, starting from rest, accelerates in the +x direction as in the figure. It has a mass of 1.10 × 103 kg and maintains an acceleration of +4.40 m/s2 for 2.60 s. Assume that a single horizontal force (not shown) accelerates the vehicle. Determine the average power generated...

**physics**

A 45-kg girl is bouncing on a trampoline. During a certain interval after leaving the surface of the trampoline, her kinetic energy decreases to 210 J from 400 J. How high does she rise during this interval? Neglect air resistance.

**physics**

A 64.2-kg skateboarder starts out with a speed of 2.21 m/s. He does 98.0 J of work on himself by pushing with his feet against the ground. In addition, friction does -276 J of work on him. In both cases, the forces doing the work are non-conservative. The final speed of the ...

**Physics**

You and another person go to the museum and decide to take a look at an exhibit that has a bike with an attached heating coil/generator. The coil is placed in a tank of water at 20 deg C. Peddling makes the coil increase the energy of the water. The goal is to make the water ...

**physics**

What mass of ice at -14°C will be needed to cool 200cm³ of an orange drink(essentially water) from 25°C to 10°C?

**Physics**

pressure of a fluid. calculate the a.) absolute pressure b.) gauge pressure at an ocean depth of 1000m. Assume the density of a sea water is 1024 kg cubic meter and that the air above exerts a pressure of 101.3kPa

**physics**

A simple U tube contains mrecury. When 13.6cm of water is poured in one arm caculate the rise of mercury in the other arm

**physics**

A man is standing on a platform that is connected to a pulley arrangement, as the drawing shows. By pulling upward on the rope with a force the man can raise the platform and himself. The total mass of the man plus the platform is 121 kg. What pulling force should the man ...

**physics**

Force F1 acts on a particle and does work W1. Force F2 acts simultaneously on the particle and does work W2. The speed of the particle does not change. Which one of the following must be true? W1 is zero, and W2 is positive W1 = - W2 W1 is positive, and W2 is positive W1 is ...

**physics**

In which one of the following circumstances does the principle of conservation of mechanical energy apply, even though a nonconservative force acts on the moving object? The nonconservative force has a component that points opposite to the displacement of the object. The ...

**physics**

A 64.2-kg skateboarder starts out with a speed of 2.21 m/s. He does 98.0 J of work on himself by pushing with his feet against the ground. In addition, friction does -276 J of work on him. In both cases, the forces doing the work are non-conservative. The final speed of the ...

**College Physics**

A 0.697-kg basketball is dropped out of a window that is 6.98 m above the ground. The ball is caught by a person whose hands are 1.73 m above the ground. (a) How much work is done on the ball by its weight? What is the gravitational potential energy of the basketball, relative...

**physics**

Juggles the clown stands on one end of a teeter-totter at rest on the ground. Bangles the clown jumps off a platform 2.5 m above the ground and lands on the other end of the teeter-totter, launching Juggles into the air. Juggles rises to a height of 3.7 m above the ground, at ...

**physics**

A 89.7-kg skier rides a 3040-m-long lift to the top of a mountain. The lift makes an angle of 14.3 ° with the horizontal. What is the change in the skier's gravitational potential energy?

**Physics**

A 400g soccer ball is moving through the air at 3.57m/s [64.8°W of N] horizontally at the top of its flight. If at that instant, the soccer ball is struck by a 450g crocket ball moving at 5.46m/s [N], and the soccer ball flies off at 4.28m/s[22.4°W of N]. What will be the ...

**Physics**

An object is 10 mters long and has a weight of 125N. The weight of the object is determined by the expression, 250N= a10m+B kg/m. What are the units of a and B

**Physics**

It takes 226 kJ of work to accelerate a car from 23.3 m/s to 28.3 m/s. What is the car's mass?

**physics**

A fisherman is fishing from a bridge and is using a "43.0-N test line." In other words, the line will sustain a maximum force of 43.0 N without breaking. What is the weight of the heaviest fish that can be pulled up vertically, when the line is reeled in (a) at constant ...

**physics**

A 1450-kg submarine rises straight up towards the surface. Seawater exerts both an upward buoyant force of 16890 N on the submarine, as well as a downward resistive force of 1010 N. What is the submarine's acceleration?

**Physics**

What is the period of a wave that travels through a spring at 2.5 m/s and has a wavelength of 1.3 meters?

**physics**

A worker stands still on a roof sloped at an angle of 43° above the horizontal. He is prevented from slipping by a static frictional force of 520 N. Find the mass of the worker.

**physics**

Part (a) of the drawing shows a bucket of water suspended from the pulley of a well; the tension in the rope is 56.0 N. Part (b) shows the same bucket of water being pulled up from the well at a constant velocity. What is the tension in the rope in part (b)?

**physics**

The drawing shows a wire tooth brace used by orthodontists. The top-most tooth is protruding slightly, and the tension in the wire exerts two forces, and , on this tooth in order to bring it back into alignment. If the forces have the same magnitude of 24.3 N, what is ...

**physics**

Three forces act on a moving object. One force has a magnitude of 76.5 N and is directed due north. Another has a magnitude of 46.3 N and is directed due west. What must be (a) the magnitude and (b) the direction of the third force, such that the object continues to move ...

**College Physics**

The space probe Deep Space 1 was launched on October 24, 1998. Its mass was 474 kg. The goal of the mission was to test a new kind of engine called an ion propulsion drive. This engine generated only a weak thrust, but it could do so over long periods of time with the ...

**Physics**

A Man Of Mass 80kg Carry A Load Of Bricks Of 20kg Up A Vertical Of Length 6m Calculate The Workdone

**Physics**

A Man Of Mass 80kg Carry A Load Of Bricks Of 20kg Up A Vertical Of Length 6m Calculate The Workdone.

**Physics**

A ball is allowed to fall freely from certain heightn. What distance it covers in 1st second?

**physics**

A body of mass 10 kg is attached to a wire 30 cm long. Area of cross section of the wire is 10 raise to power -6 metre square. It's breaking stress is 4.8×10 raise to power 7 N/metre square. Find maximum angular velocity with which it can be rotated in the horizontal circle?

**Physics**

Two blocks at rest on a frictionless inclined surface with mass of 3kg on a side inclined at 42° to the horizontal and mass 4.8kg a side inclined at 30° to the horizonal. if the two bodies are attached together by an extensible string passed through a pulley. A) Determine ...

**Physics**

Two forces are applied to a box on a frictionless surface. One force is 40 N [S]. The second force is 70 N [N30ºW]. What is the overall net force? a) 40.6 N [S59.5ºE] b) 110 N c) 40.6 N [N59.5ºW] d) 40.6 N [S30.5ºW]

**Physics**

An electric heater raises the temperature of 120g of water in a thin light vessel through 10K in 2mins, when placed in 70g of water contained in a metal vessel of mass 0.55kg the temperature rises through 9K in the same time. Calculate from the above: a)the heat supplied in ...

**Physics**

what mass of ice at -14'c will be needed to cool 200cm3 of an orange drink (essentially water) from 25'c to 10'c! (specific latent heat of fusion of ice =336000) (specific heat capacity of ice = 2100) (specific heat capacity of water = 4200)

**Physics**

calculate the specific heat capacity of the materials for which the heat supply, mass, and temperature rises are given below: i)25200J, 0.3Kg,20K ii)8000J, 500g, from 20'C to 60'C iii)9450J, 150g, from 15'C to 45'C

**physics**

an electric heater raises the temperature of 120g of water in a thin light vessel through 10K in 2mins, when placed in 70g of water contained in a metal vessel of mass 0.55kg the temperature rises through 9K in the same time. Calculate from the above: a)the heat supplied in ...

**physics**

calculate the specific heat capacity of the materials for which the heat supply, mass, and temperature rises are given below: i)25200J, 0.3Kg ii)8000J, 500g, from 20'C to 60'C iii)9450J, 150g, from 15'C to 45'C

**physics**

150g of ice at 0'c is mixed with 300g of water at 50'c. calculate the temperature of a mixture

**physics**

1) what mass of ice at -14'c will be needed to cool 200cm3 of an orange drink (essentially water) from 25'c to 10'c! (specific latent heat of fusion of ice =336000) (specific heat capacity of ice = 2100) (specific heat capacity of water = 4200)

**Physics**

An airplane travelling north at 400 m/s is accelerated due east at a rate of 50m/s^2 for 6 seconds. If the effects of air resistance and gravity are ignored, what is the final speed of the plane? My working: v=vo+at where a=50m/s Vo = 400 m/s t = 6s thus: Vo=400+50(6) =700m/s ...

**Physics**

Can someone please tell me how to derive this: its supposed to be projectile motion with spring x = Sqrt (dx*g*1/2*m) +(mgh sin2theta) ---------------------------- (1/2)(k)(sin2theta) all i got is r =v^2sin2theta / g x is displacement of elastic plz help

**physics**

Water is flowing in a pipe with a circular cross-section area ,and at all point the water completely fills the pipe.At point 1 ,the cross sectiona are of pipe is 0.070 meter square and the fluid velocity is 3.50 meter per second. a.) what is the fluid speed at point in the ...

**pure physics**

a stone weighs 0.25N in air and o.20N when completely immersed in water. what is the the up thrust on the stone?

**physics`**

which has more momentum: a snail moving at .001m/s or a 2-ton boulder resting on the ground? why?

**Physics**

The man pushes/pulls with a force of 200N. The child and the slide combo has a mass of 30 kg and coefficient of friction is 0.15. The angle between the slide and the ground is 30 degrees. Find the acceleration of the child and what is the frictional forces opposing his efforts

**Physics**

Can someone please tell me how to derive this: its supposed to be projectile motion with spring x = Sqrt (dx*g*1/2*m) +(mgh sin2theta) ---------------------------- (1/2)(k)(sin2theta) all i got is r =v^2sin2theta / g x is displacement of elastic plz help

**Physics**

An impulse of 25 N*s is exerted on a 0.25 kg baseball traveling 40 m/s west. What is the velocity of the baseball after it has been hit?

**Physics**

A ball with mass m=1kg and speed vo=5m/sec elastically collides with a stationary, identical ball (all resting on a frictionless surface so gravity is irrelevant). A student measures the top ball emerging from the collision at at speed vt=4m/sec at an angle ϴt ≈ 37°. a) ...

**Physics**

A car moving at 60 km/h skids 13 m with locked brakes. How far will the car skid with locked brakes at 180 km/h?

**Physics**

A great white shark of mass m1, coasting through the water in a nearly frictionless way at speed v1 engulfs a tuna of mass m2=0.10 m1 traveling in the same direction at speed v2 swallowing it in one bite. a) What is the speed of the shark after its meal? b) Did the shark gain...

**Physics**

the orbital period of the moon is 27.32 days. The international space station has an orbital period of 90 minutes. What is the mean distance between the center of the earth and the center of the international space station? moons orbital radius: 25,201

**Physics**

A bullet of mass m travelling at speed vo in the direction shohwn above strikes a block of mass M and embeds itself in it. The block is sitting on the edge of a frictionless table of height H and is knocked off of the table by the collision. a) What is the speed vb of the ...

**Physics**

A hammer of mass m falls from rest off of a roof and drops a height H onto your head. a) Assuming that the tool is in actual contact with your head for a time △t before it stops and slides off, what is the algebraic expression for the average force it exerts on your skull ...

**Math, Physics**

Calculate Earth's gravitational force on the ISS astronauts while orbiting at an altitude of 401.5 km above Earth’s surface.

**physics**

A boy lining a railway bridge 49ft. high, sees a train uproaching with uniform speed and attempt to drop a stone down to railway. He releases the stone when engine is 80ft. away from the point below his position and sees the stone hits in the ground just 3 ft. in front of the ...