Math/Physics

207,579 results, page 85

PHYSICS/CHEMISTRY

Can someone explain to me, what does Metastable isotope means? I already read the definitions on the internet but I really don't understand it. Thanks in advance.

physics

a 75-kilogram bicylcist coasts down a hill at a constant speed of 12 meters per second. what is the kinetic energyof the bicyclist?

physics

How many calories of heat must be added to 455 g of steel to raise its temperature from 20 °C to 192 °C? (Note: csteel = 0.115 cal./g. °C.)

physics

How far to the nearest tenth of a meter can a runner running at 5.33 m/s run in the time it takes a rock to fall from rest 67 meters?

physics

A solid sphere of mass 2 kg is rolling without slipping on a table with linear speed of 0.5 m/s. Calculate its total kinetic energy.

Physics

At what distance should an object be placed in front of a convex lens of focal length 20 cm to obtain an image of double its size

science (physics)

a skaterboarder is moving 5.25 m/s when he starts to roll up a frictionless hill. how much higher is he when he comes to a stop? (energy problem)

Physics

An arrow of mass 1000kg was fired from rest with a velocity of 15m/secs for a period of 0.5secs.calculate the applied force.

physics

a monatomic gas initially at 19 degree celsius is suddenly compressed to 1/10th its original volume .what is temperature after compression?

physics

two ropes are tied on a post and applied with forces of 8 and ion.If the amgle between them is 60degrees. Find the resultant vector

Physics

A block weighing 6.2 N requires a force of 2.2 N to push it along at constant velocity. What is the cooefficient of friction for the surface? Plsssss help asap..

physics

What mass would you hang on the right side of the system in the figure to balance it -- that is, to make the clockwise and counterclockwise torques equal? (Let x1 = 30 cm and x2 = 12 cm.)

Physics

The flux through a window whose surface is parallel to magnetic field lines is zero. Answer True False

Physics

A material that remains highly magnetized after a magnetization cycle has a large hysteresis area. Answer True False

physics (fluids)

If a object of radius 3 cm is attached to the ground in a 3 m deep sea, what is the vertical force in N with which the water (density = 1000 kg/m^3) presses on it?

physics

Using a small pendulum of length 0.171 m, a geophysicist observes that it completes 1 cycle every 0.833 s. What is the value of g at his location?

physics

An 8 hour exposure to a sound level of 95.0 dB may cause hearing damage. What energy in joules falls on a 0.850 cm diameter eardrum so exposed?

physics

An 8 hour exposure to a sound level of 95.0 dB may cause hearing damage. What energy in joules falls on a 0.850 cm diameter eardrum so exposed?

physics

An 8 hour exposure to a sound level of 95.0 dB may cause hearing damage. What energy in joules falls on a 0.850 cm diameter eardrum so exposed?

physics 2

calculate the mass of air inside a 500 liter container at a pressure of 200 kpaa and temperature is 30 degree celsuis

Physics

“Strontium-90 is a pure beta source.” How could a physicist test this statement? I am stuck on this one, but I was thinking through measurement of radioactivity.

physics

A bullet was fired horizontally from the top of a 1.5x10^2 m tall tower at 2.8x10^2 m/s. Determine its speed on impact with the ground below.

Physics

If Joe rides south on his bicycle in a straight line for 29 min with an average speed of 14.8 km/h, how far has he ridden? Answer in units of km

Physics

A boy sledding down a hill accelerates at 1.24 m/s2 . If he started from rest, in what distance would he reach a speed of 8.88 m/s? Answer in units of m

Physics

An elevator is moving upward 1.17 m/s when it experiences an acceleration of 0.33 m/s2 downward, over a distance of 0.75 m. What will its final speed be? Answer in units of m/s

Physics

If a car is going .197 meters per second, how long will it take to go 5 kilometers (assuming the ground is perfectly flat).

Physics

A ball rolling down a hill was displaced at 19.6m while uniformly accelerating from rest. If the final velocity was 5.00 m/s what was the rate of acceptation?

physics PLEASE HELP ME

a rubber ball is thrown downwards off a balcony. after it travels 55m it has a speed of 46.5m/s. what is the initial velocity

physics

If you push a box a distance of 2,000 meters with a force of 1 newton, how many Calories have you used? 1 Calorie= 4,187 Joules

physics

What is the angular separation between the first-order images on either side of the central maximum? Answer in units of degrees.

physics

A violin string vibrates at 298 Hz when unfingered. At what frequency will it vibrate if it is fingered one sixth of the way down from the end?

Physics

What happens to your tongue when you lick an aluminum ice cream scrapper just after it has been used? Does it stick to the scraper? Why?

Physics

What happens to your tongue when you lick an aluminum ice cream scrapper just after it has been used? Does it stick to the scraper? Why?

physics

The coefficient of kinetic friction for a 22 kg bobsled on a track is 0.20. What force is required to push it down a 6.0° incline and achieve a speed of 64 km/h at the end of 75 m?

physics

As a projectile shot at an upward angle rises and falls what happens to its horizontal component of its velocity if we neglect air resistance?

Physics

In a vacuum, two particles have charges of q1 and q2, where q1 = +3.7 µC. They are separated by a distance of 0.22 m, and particle 1 experiences an attractive force of 3.5 N. What is q2 (magnitude and sign)?

Physics

If you stood atop a ladder that was so tall that you were twice as far from Earth's center, how would your weight compare with its present value?

physics

A ray of light goes through the centre of a semicircular glass disk, n = 1.58, and onto a wall (x = 19.4 cm, y = 5.06 cm). What is the incident angle, θ?

Physics

How much charge is contained in 9kg of electrons? Express your answer to two significant figures and include the appropriate units.

Physics

How much charge is contained in 9kg of protons? Express your answer to two significant figures and include the appropriate units.

physics

What is the expected period of beats formed when two tuning forks sound simultaneously and have the frequencies f1= 250Hz and 242Hz?

physics

a framed painting weighs 220 newtons. the 2 wires support an angle of 120 degrees with each other. what are the tensions on the wire?

physics

Find the pottential energy of a boy of mass 10kg standing on a building floor 10 meters above the ground level p.e?

physics

A 750 kg rocket accelerates straight upward from the ground at 60 m/s2. What is the force (thrust) provided by the engine? with a gravitational pull of 10 m/s2 down

physics

you are driving up a long, inclined road . after 1.20 mi you notice that signs along the roadside indicate that your elevation has increased by 550 ft.

physics

How far to the nearest tenth of a meter can a runner running at 10 m/s run in the time it takes a rock to fall from rest 99 meters?

Physics

A 172 N sign is supported in a motionless position by two ropes that each make an angle of 36° with the horizontal. What force does each rope exert?

physics

Five forces act on an object. (1) 57 N at 90° (2) 40 N at 0° (3) 77 N at 270° (4) 40 N at 180° (5) 50 N at 60° What are the magnitude and direction of a sixth force that would produce equilibrium?

Physics

The peak wavelength and observed color of a 50,000 K star is 58nm and too blue to see with the human eye. True or False.

physics

A 1200kg car travels at a constant speed of 12 m/s around a horizontal, circular track with a radius of 45m. What is the magnitude of the centripetal for

Physics

two objects attract each other gravitationally with a force of (2.5)(10^-10)N when they are 0.25m apart. Their total mass is 4.0 kg. Find their individual masses.

Physics

If m1 = 4.72kg, what mass m2 is required to balance the system? (two masses are connected by a rope. m1 is sitting on an incline and m2 is hanging from a pulley)

physics

calculate the work done on a 1550kg elevator car by its cable to lift it 40 m at constant speed assuming friction average 125 n

physics

a car that's 1000 kg is stopped and the brakes exert a force of 3000 N over a distance of 891 meter, how much work is done?

physics

a bus starts from rest and achieves a velocity of 20m/s in 10s while moving westwards.calculate its avarage acceleration

physics

Two forces F1 and F2 ifF1is double that ofF2 and the resultant is perpendicular on F1 then the angle betwee them is Expain ans with reason and diagram

physics

Which of the following situations represents a negative displacement? (Assume positive position is measured vertically upward along a y-axis.)

physics

An american system of communication is based on the radio frequency of 76 Hz. Compute the wavelength of theses waves and compare it to the diameter of the earth.

physics

An electric stove operates on a larger 220 V line. How much power is needed to cook a pizza if 0.45 A of current is used.

Physics

The displacement, force, velocity, and acceleration vectors’ components are given. Calculate the magnitude and direction of each vector. (a) x = +15.0 cm, y = -12.3 cm. I am completely lost.

physics

The gravitational field strength of an unknown planet is 15.5 N/kg on its surface. Calculate the value of g if the planets mass and radius were both doubled.

Physics

A car of mass is 100 kg applies break from 40 km per hours to 0 .it takes 12 seconds .what amount of force is applied for breaks?

physics

A 31.4-kg diver free falls from the diving board and hits the water with a speed of 10.0 m/s. Based on this information, the height of the tower is __________

physics

Show that the critical velocity of body revolving in cercular orbit very close to the surface of a planet of radiuis R and meandencity.

Physics

Given an angle of 30 degrees, find the minimum initial speed of a cannon ball that travels in a horizontal distance of 15000 mi.

physics

A carton of juice remains intact even after you have sucked out all the drink from it. please explain

Physics

A body's temperature is increased from 900K to 1900K. By what factor does the total power radiated per unit area increase?

Physics

What is the threshold frequency for the photoelectric effect on lithium (phi= 2.93eV)? What is the stopping potential if the wavelength of the incident light is 400nm?

Physics

A television tube operates at 20,000V. What is min wavelength for the continuous x-ray spectrum produced when the electrons hit the phosphor?

Physics

Starting from rest, Mr.M's bus achieves a velocity of 25 m/s in a distance of 1.0 km. Find the time and the acceleration. I don't know which formula to use. Delta T = Vf - Vi / Aavg ?

Physics

A body's temperature is increased from 900K to 1900K. By what factor does the total power radiated per unit area increase?

Physics

What is the threshold frequency for the photoelectric effect on lithium (phi= 2.93eV)? What is the stopping potential if the wavelength of the incident light is 400nm?

Physics

A television tube operates at 20,000V. What is min wavelength for the continuous x-ray spectrum produced when the electrons hit the phosphor?

Physics

What is the threshold frequency for the photoelectric effect on lithium (phi= 2.93eV)? What is the stopping potential if the wavelength of the incident light is 400nm?

Physics

A television tube operates at 20,000V. What is min wavelength for the continuous x-ray spectrum produced when the electrons hit the phosphor?

physics

Consider the following specific case of the system described in the example above. Suppose the angle θ is 78.0° and the mass of the ball is 7.00 kg.

physics

A power line 10 meter high carries a current 200 amperes .Find the magnetic field of the wire at ground?

Physics

Which method of sliding a block of ice requires less force—(a) pushing or (b) pulling at the same angle above the horizontal?

physics

for the uniform T shaped structure with mass 3M moment of inertia about an axis normal to the plane & passing through O would be

physics...damon please help

Thirty microcoulombs of NEGATIVE charge experiences an electrostatic force of 27. mN. What is the magnitude and direction of the electric field?

physics

the mass of the truckand its contents is 7460kg. find the magnitude of the forces exerted by the ground a) the front wheels b)the rearwheels of the truck.

physics

why is it that drivers place cement blocks and other heavy items in the trucks of their vehicles? (think of friction and normal force)

Physics

If you are at the top of a toboggan run that is 44.3 m high, how fast will you be going at the bottom, provided you can ignore friction between the sled and the track?

physics

draw a particle model and a motion diagram for A bike travels at constant speed of 4.0 m/s for 4 s then slow down to come at rest in 3 s.

physics

A 75 kg hockey player glides across the ice on his skates with steel blades. What is the magnitude of the force of friction acting on the skater?

Physics

1) Please describe the structure of a hurricane,and how they work. Include a discussion of how energy is transferred from the warm ocean water up to the sky.

physics

A 1.2 lead ball is launched off a cliff top at 16 m/s Determine the balls kinetic energy at position P. Ignore friction

physics

A circular swimming pool has a flat bottom and a 4.39 m diameter. It is filled with water to a depth of 1.51 m. There is 1.36 atm of pressure on the top surface.

physics

The coldest and hottest temperatures ever recorded in the United States are -83°F and 135°F, respectively. What is the speed of sound in air at each temperature?

physics

A glacier advances at 4.3 × 10−6 cm/s.How far will it move in 6.4 years? Assume there is 365 days each year. Answer in units of cm. Thanks in advance!!

physics

A red flower seen in the light of mercury vapour lamp through a green filter wil appear in what colour?

Chemistry/Physics

When 1mol of a gas burns at constant pressure, it produces 2430J of heat and does 5kJ of work. Calculate change in H, q, and in kJ?

physics

A car of mass 200g moving at 15.0m/s is accelerated to 25.0m/s in a time of 10.0 seconds determine the accelerating force and calculate the work done on the body

physics

A robot arm expends 15J of work to extend a spring 10cm from its equilibrium position. How much force is required?

PHYSICS

An airplane accelerates down a runway at 3.20 m/s 2 for 32.8 s until is finally lifts off the ground. Determine the distancetraveled before takeoff.

physics

How much thrust is required to launch a 5 kg bottle rocket with an upward acceleration of 6.4 m/s2? I've gotten 32 because F=MA but I don't understand how to account for gravity. Please help!

physics

what will be the centipetal acceleration on a man whose mass is 80 kg,when resting on a ground at the equator if the radius of the earth'R' is 6.4x10 power 6 meter.

physics

two forces of the same magnitude act at a point.the square of their resultant is 3 times the product of their magnitudes.the angle between them is?

physics

A quantity of steam (750 g) at 122°C is condensed, and the resulting water is frozen into ice at 0°C. How much heat was removed?

physics

A ball is thrown straight up and reaches a maximum height of 6.57 m . What was its initial speed? The accelera- tion of gravity is 9.8 m/s2 . Answer in units of m/s

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