Plz help me with a physics question I’ve got no idea how to do it?
Dee is on a swing in the playground. The chains are 2.5m long and the tension of each chain Is 350N when Dee is 45 cm above the lowest point of her swing. Tension is a vector directed along the chain, measured in Newtons, abbreviated N. a) what is the magnitude of the horizontal component of the tension at this point in the swing? b) what is the magnitude of the vertical component of the tension at this point in the swing? I’d really appreciate some help I have no idea how to do this and it’s not in my notes.
Physics Question? plz help?
Units
Physics question... plz help!!?
First of all proper time interval is the smallest when time-span of events is measured from different frames of reference. secondly, that passage of time will be ascribed to as "proper time interval" for which the CLOCK is rest with respect to the moving observer. See, crew's clock is at rest with respect to spaceship, whereas OUR clock is moving wrt the moving crew. Correct answer C : Δt' is the proper time for the passage and it is smaller than Δt also, this is the very basis of TWIN Paradox whereby twin-in-transit finds his age actual (REAL, as if no impact of motion) whereas twin-at-rest aged (Δt) much faster or was found much older on return.
Help physics : Question about measurement of specific heat capacity of water?
the usual method I used in the lab was with a low voltage heater linked to a joule meter. This meter recorded the exact amount of electrical energy that the heater put into the known mass of water water. A thermometer recorded the temperature rise over a short period of time. Then the value of specific heat capacity (c) could be calculated Q (quantity of energy in joules) = mass x c x temperature rise precautions - insulate vessel holding water - keep measuring temperature rise after heater switched off( heat continues to be emitted) - have lid on the container - use an electonic thermometer for accuracy. Errors will arise - as heat goes into the container as well as the water - this can be calculated if required. heat losses due to conduction, convection and radiation need to be calculated. The electrical energy consumed is not exactly the same as the heat energy emitted.
Physics - the speed of a beam of pions!!!! EASY QUESTION PLZ HELP!!!!?
What is the speed of a beam of pions if their average lifetime is measured to be 4.10 x 10-8 s? At rest, their lifetime is 2.60 x 10-8 s. the answer is in c.
I need help with these physics questions plz!?
Hello Flygirl, 1) First use a vertical equation of motion to get the time to reach the ground, then use that time with the constant horizontal velocity to get the distance traveled. First we need an equation of motion that we can use vertically with everything but the final velocity, cause we know the initial vertical velocity is zero, we know the acceleration is -g, we know the vertical distance is H and we want to know time http://en.wikipedia.org/wiki/Equation_of... We will take s = s0 + Vi * t + 1/2 a t^2 and rewrite for vertical motion like this. H = 1/2 * g * t^2 (remember, Vi in the y direction is zero) t = sqrt ( 2 * H / g) We could solve for the time now and plug it into this equation to get distance X = Vix * t Lets plug our t in here X = Vix * sqrt ( 2 * H / g) There you go, all in one equation. X = (8 m/s) * sqrt ( 2 * 1 m / 9.81 m/s^2) X = 3.6 m 2) Joules is also the unit of work so I'm gonna say 3 billion Joules. conservation of energy days that the PE would be reduced by 3 billion joules Good Luck
Physics help true or false questions plz help!!!!!!!!!!!!!!!!!!!!!?
When the velocity is constant, the average velocity over any time interval can not differ from the instantaneous velocity at that instant. If the acceleration of a body is constant as measured from a given reference frame, it is necessarily constant when measured from all other reference frames. The velocity of an object can reverse direction when its acceleration is constant. An object with a constant speed can not accelerate. An object can have a zero velocity and still be accelerating.
What is the need for measurement of a physical quantity?
The way science works is to construct a model (hypothesis) based on observation (experiment), then use it to make predictions, which are further validated by observation.Observation plays a central role in it. It’s where the “data” about the world come from. But in order to make reliable observations, you have to agree on what it is you’re observing. What this boils down to is what’s called an “operational definition”, and an operation definition is a procedure for making a measurement. Measurement is central to all of science.As an example, take “intelligence”. It’s a pretty vague idea, but you have to start somewhere. William Stern was the first to come up with an operational definition—he defined it to be the ratio of a person’s “mental age” to their chronological age, and mental age was to be measured by a test he had devised. The result was called the Intelligenzquotient, and is what we usually call “IQ”.Now, does that actually measure intelligence? Who knows? We don’t actually know what intelligence is, but it measures something, and it’s plausible that whatever it’s measuring is at least related to real intelligence, and we can try using it to make predictions and see what we can predict with it and what we can’t. To the extent that it lets us predict things, it’s a useful measure of at least some aspect of intelligence, and it makes sense to say that it’s measuring something “real”.This kind of thing happens throughout science. Daniel Fahrenheit realized that mercury expands when heated, so he built a narrow tube, partially filled it with mercury, evacuated the rest and had the first thermometer. He used it to measure his body temperature, and then found the coldest thing he could make in his lab (a mixture of salt and ice), marked those two spots on the tube and marked 100 divisions between them. That’s now called the Fahrenheit temperature scale (presumably he was running a slight fever that day).Measurement is central to science. Unless you can find something to measure, you can’t operationalize your definitions, so you effectively can’t make a proper scientific definition.
Physics PLZ HELP?
In 1962, measurements of the magnetic field of a large tornado were made at the Geophysical Observatory in Tulsa, Oklahoma. If the magnitude of the tornado's field was B = 13.50 nT pointing north when the tornado was 8.10 km east of the observatory, what current was carried up or down the funnel of the tornado? Model the vortex as a long, straight wire carrying a current. In 1962, measurements of the magnetic field of a large tornado were made at the Geophysical Observatory in Tulsa, Oklahoma. If the magnitude of the tornado's field was B = 13.50 nT pointing north when the tornado was 8.10 km east of the observatory, what current was carried up or down the funnel of the tornado? Model the vortex as a long, straight wire carrying a current. plz help
I NEED HELP FAST FOR PHYSICS PLZ EASY?
Ok, if you know a lot about physics, or know a great website I can go to, plz Help me with a question. What is the percent uncertainty in the measurement 2.26+/- (plus or minus) .25 m . I just need an explanation, please include sig figs if these types of problems require sig figs. This was our first day of class assignment, after we never learned anything today... Please respond before tommorrow. Thanks