# Math/Physics

215,876 results, page 50-
## physics

5. An object that has kinetic energy must have A) momentum. B) acceleration. C) a force applied to it. D) All of these. E) None of these. -
## Physics

What angle should you rotate a mirror so that a reflected ray rotates through 28 degrees. I got 20, but i am not sure, please help -
## Physics

What is the fundamental frequency on a 5 m rope that is tied at both ends if the speed of the waves is 24 m/s? -
## physics

An 80 kg skateboarder going 10 m / s is launched nearly vertically off a ramp as shown. Approximately how high does he go? -
## physics

Find an expression for the energy densityin terms of stress and strain. -
## physics

A ball is dropped from the roof of a building. How much time does it take to reach a velocity of 15.4 m/s? -
## Physics

A ball is thrown downward at 12.3 m/s. How much time does it take for it to reach the ground, 182.6 m below? -
## physics

what impulse is needed to slow a 45kg object from 15m/s to 12m/s? -
## physics

5. What is the acceleration of a 20 N object that is pulled up a 30° incline by a 25 N force? The coefficient of friction is 0.30. -
## physics

ifv=(3i+4j+5k)m/s is the instantaneous velocity of a body mass 1.50kg calculate its K.E -
## Physics

Two point charges of magnitude 2.0 X 10^-7 C and 85 X 10^-8 C are placed 12 cm apart .What is the field intensity of each charge at the site of other ? -
## physics

how does temperature affect the time it takes to reach thermal equilibrium? -
## physics

which of acceleration age speed temperature and velocity are vector quantities -
## physics

what is the kinetic energy of a 200 g bullet travelling at a velocity of 400 m/s? -
## Physics

If a racehorse starts from rest and accelerates at a rate of 4.7 m/s2, how long does it take the horse to go 20 m? -
## physics

A ball is dropped from the roof of a building. How fast is it moving after 4.6 seconds? -
## physics

What is the magnitude of the acceleration of a sprinter running at 9.0 m/s when rounding a turn of a radius 26 m? -
## Physics

Let U=(13i3−i). What is U†? Explicitly indicate multiplication with a * symbol. For instance, you should write 3*i+2 instead of 3i+2. -
## physics

What force is needed to accelerate a child on a sled (total mass = 60 kg) at 1.25 m/s2? -
## Physics

You have a circular table. You measured its radius to be 10 cm with an uncertainty dr =+/- 3mm. The area would be A +/- a cm^2. a. What is A? b. What is a? -
## Physics

Identify the correct neutrino (Ve, Vµ, Vτ or their anti-particles) a) π+ —> p° + e+ + v b) π+ —> p° + µ+ + v c) τ+ —> e- + v + v Please explain why too...I'm really lost. I'd appreciate any help. -
## Physics

A vibrating point on a spring travels 60 mm during three cycles. What is the amplitude of the vibration? -
## Physics

how much heat is needed to vaporize a 400.0 g of liquid water at 310.0 K? -
## physics

How will changing the distance change the electric field strength for a given charge? -
## physics

If the electron experiences a force of 5.6 x 10-6 N, how large is the field between the deflection plates? -
## Physics

You have a circular table. You measured its radius to be 10 cm with an uncertainty dr =+/- 3mm. The area would be A +/- a cm^2. a. What is A? b. What is a? -
## physics

find the %error in the measurement of refractive index of glass. the values was 1.54,1.53,1.44,1.54,1.56& 1.45. -
## Physics

If a car increases its speed from 5 m/s to 25 m/s over 40 seconds. what is the acceleration? Give the unit. -
## physics

why it is easier to tear a paper off a full roll than a mostly used one? Is it because of Newton's law? -
## physics

The acceleration of a certain rocket is given by a=bt where b is positive cnstant, find the position function Xo and Vo at t=o? -
## physics

10 kg of ice at -4 C is dropped into 15.1 kg of water at 36 C. What is the final temperature of the mixture? T_final = -
## physics

How will changing the charge change the electric field strength at a distance? -
## physics

find the moment of inertia of the earth. Radius is 6,000 km and mass is 6 x 10^24 kg -
## physics

You throw a ball straight up at 25 m/s. How many seconds elapse before it is traveling downward at 13 m/s? 1 s -
## physics

3. A 5 N block slides down a 20° incline at constant speed. What is the frictional force? -
## Grade 11 Physics

Rearrange the equation : d=v2t - 1/2at(squared) to solve for a -
## physics

If a bug traveled a distance of 180 meters at a speed of 15 m/s, what was the time? -
## Physics 221

How much charge flows through a 12 –V battery when a 2.0 mF capacitor is connected across its terminals? -
## physics

A soccer ball has a diameter of about 22 cm and a mass of about 430 g. What is its terminal velocity? -
## physics

A car accelerates from rest at 2.57 m/s2. What is the velocity at the end of 5.4 s? Answer in units of m/s -
## Physics

What’s the specific heat of a material if it takes 6.5 kJ to increase the temperature of a 1.8 kg sample by 6.4 ∘C ? -
## Physics

For a pendulum that completes fifteen complete swings in 34.8 seconds, how much is the frequency? -
## Physics

What equation gives the velocity as a function of time for an object with constant acceleration? -
## physics

if it costs 4.5 to 7.5 cents per kilowatt-hour (wind energy) what is the price per kW? -
## physics

if I drop a camera 40m high,how long before it hits the floor? G= 9.81 -
## Physics

Runners in the 100-m dash use starting blocks. Explain what this device does. PLEASE HELP. -
## physics

masses of 3,5,7,8 kg are suspended at equal distances of 1 m from rod.Find the CG of the arrangement. -
## physics

5. What is the acceleration of a 20 N object that is pulled up a 30° incline by a 25 N force? The coefficient of friction is 0.30 -
## physics

whats the acceleration of a car traveling 402 meters in 6 seconds -
## physics

The sensitivity of a galvanometer of resistance 990ohm is increased by 10 times.The shunt used is?? -
## physics

how long will it take for an apple falling from a 29.4m tall tree to hit the ground? how -
## physics

You throw a ball straight up at 25 m/s. How many seconds elapse before it is traveling downward at 13 m/s? -
## physics

a year ago she measured 98cm from her tree . now it 1.1m tall how much has it grown -
## physics

3. A 5 N block slides down a 20° incline at constant speed. What is the frictional force? -
## Physics

If a 75-kg skater starts his skate at 8.0m, at his lowest point (height = 0), what is his velocity? -
## physics

What capacitance is required to store an energy of 13 kW·h at a potential difference of 940 V? -
## physics

TWO R WHEN CONNECTED IN PARALLEL GIVE RESULTANT VALUE BECOMES 9 OHM CALCULATE VALUE OF REESISTIVITY -
## physics

5. An object that has kinetic energy must have A) momentum. B) acceleration. C) a force applied to it. D) All of these. E) None of these. -
## physics

Two point charges, each 6*10-5 C, are separated by 30 cm. What is the electrostatic force produced by this arrangement? -
## Physics

A ball thrown downward with an initial velocity of 20m/s.what will be itsvelocity after 5s -
## Physics(light)

why the ray reflected by the prism is brighter than that by the plane mirror? -
## 9th grade conceptual physics

How do you find the cargo capacity for a boat? -
## physics.

an object travels 219 meters with acceleration 6.43 m/s^2 over an interval of 2.86 seconds. What are Vi and Vf. -
## physics

A 2.7 kg object falls from a tower. It experiences 2.3 N of air resistance. What is the acceleration? -
## physics

An object has a length of 5.0 cm, a height of 3.0 cm and a width of 15.0 cm. It has a mass of 24 grams. What is its density? -
## physics

explain the input energy and out put energies of two kitchen machines -
## Physics

In the photoelectric effect, what determines the kinetic energy of the ejected electrons? -
## physics

What equation gives the position as a function of time for an object with constant acceleration? -
## physics

what is the gravitational force on a 60k person on the earth, due to the moon? -
## physics

find the impulse on a baqseball that is hit 80N of force in a time of 0.52 s -
## Physics

How much work must be done to accelerate an 8x105 kg train: a) from 10 m/s to 15 m/s; b) from 15 m/s to 20 m/s; c) to a stop an initial speed of 20 m/s? -
## Physics!

A 40 kg girl runs up a flight of stairs that is 34 m high. How much work does this require? -
## physics

Calculate the angular velocity of a swinging pendulum whose length is 125cm -
## physics

can anyone give me a site that "best explains" about Rotational motion/Angular. thanks a lot.. :) -
## physics

An object is thrown vertically upward with a speed of 19.1 m/s. How high does it rise? -
## Physics

what is the schwarzschild radius of a black hole with a mass of 1.68x10^43kg -
## physics

spring has k=82 N/m use a graph to determine the work needed to stretch it from x= 3.8 cm to x=6.2 cm where x is the displacement -
## physics

A lizard accelerates from 2m/s to 10m/s in 4 seconds. What is the lizards average acceleration? -
## physics

What is the wavelength of the higher frequency limit (18 megahertz) in dry air at 0 C? -
## Physics

When hitting a golf ball, does the force of gravity increase or decrease?? -
## physics

Explain why voltage doesn't change when connecting resistance in series -
## Physics

If a car accelerates from rest to 15 m/s for a distance of 200 m. What is the magnitude of acceleration? -
## Physics

What weight of water is required to fill a 80 gallon aquarium? The answer must be in kN -
## Physics

P= 231fraction numerator f t asterisk times l b over denominator s end fraction t= 14.3s W= ? -
## physics

where would the image of a 4.0 cm tall object that is 12 cm in front of a flat mirror be located? -
## Physics

Two forces of 4 N and 6 N act at a point along the same horizontal line. What is its resultant force? -
## physics

how to show with the help of a model that resistivity of a conductor increases with increase in temperature? -
## physics

What is the concentration (in g/100ml ) of a solution which has 2,8g of NaCI dissolved into 88.0ml of water? -
## Physics

How many calories of heat are gained to turn 10 grams of ice at 0 C into water at 0 C? -
## physics

A car is moving down a highway at -15 m/s and accelerating at 3 m/s^2. If it's initial position is at x = 0 m where will it be after 3 seconds? -
## physics

explain the input energy and out put energies of two kitchen machines -
## physics

if r1=2ohms, r2=4ohms, r3=6ohms. Then what is the voltmer reading connected in series -
## Physics

If the specific volume of red brass is 0.001865 ft/3lb. What would be the density? Thanks! -
## Physics

Show that work done in a wire, E=YAsqr(e)/2l, explainthe symbols. pls help.thanks -
## physics please help!

find the speed of sound (in m/s) at -35°C at 1 atm pressure in dry air -
## physics

Find the density of the earth if its mass is 6×10^3kg and radius is 6.4×10^3km -
## Physics

If you combine 34 kg of ice at 0°C with 80 kg of steam at 100°C, what is the final temperature of the system? °C -
## PHYSICS

A hypothetical planet has a mass 1.49 times that of Earth, but the same radius. What is g near its surface? -
## Physics! NEED HELP!

A 40 kg girl runs up a flight of stairs that is 34 m high. How much work does this require? -
## physics

What is meant by the statement that the specific latent heat of steam is 2260000jkg