Physics

Which of these is not a standard unit?a. second b. metrec. hand span d. gram
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Radon-220 is a radioactive gas. It escapes from underground rocks and causes a large part of the natural background radiation in the United Kingdom. It has an atomic number of 86. How many neutrons are there in its nucleus?
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A girl with a mass of 22 kg is playing on a swing. There are three main forces acting on her at any time: gravity, force due to centripetal acceleration, and the tension in the swing's chain (ignore the effects of air resistance). At the instant shown in the image below, she is at the bottom of the swing and is traveling at a constant speed of 2 m/s. What is the tension in the swing's chain at this time? (Recall that g = 9.8 m/s^2)A. 97.5NB. 180.9NC. 237.6ND. 117.4N
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The sun warms Earth through the process of _________conductionconvectioninsulationradiation
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Someone who strength trains twice a week can reduce their muscle loss percentage from % to % every decade.
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A wave with a frequency of 5Hz travels a distance of 40mm in 2 seconds.What is the speed of the wave
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Whether or not the information on an online source is credible and factual, is up to the user to decide.
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1. Using pollen grains placed in water,explain how their motion supports theidea that matter is not continuous.
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Please help, its the last question and Im bad at Physics
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3. A woman drove her car from home to her daughter's school. The odometre on her dashboard says she travelled 4.5 km to do this. She then immediately drove back home, using a different route, which was 5.5 km long. The whole journey took 30 minutes.a. What distance did she travel?b. What was her displacement?C. What was her average speed during the journey?
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Sound travels Faster through _____________ mediums.A) DenserB) Less DenseC) ColderD) Sound always travels at the same period
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Gravitational potential energy (1) - masss (kg) x gravitational field strength (N/kg) x height (m)1. Calculate the gravitational potential energy of the following masses on top of Trump tower which has a massof 202 m (g= 9.81 N/kg)a) 100 kgb) 90 kgc) 45 kgd) 58 kge) 1g1) 1000 gh) 19981) 1.5 kgg) 100 g
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Convert 15000km/hr into m/s
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The gravitational force between two objects in space is 800 millionnewtons. If the distance between them is doubled, what size will thegravitational force be (in millions of newtons)?
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how are work and power shown when you are driving a car?
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A custodian pulls a vacuum 13.5 mwith a 33.9 N force at a 55.0angle, against a 14.2 N frictionforce. Find the total work done onthe vacuum.(Unit = J)
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Which of the following types of models could be used to represent a cell?a.idea modelb.physical modelc.computer modeld.all of the above
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A sodium vapor lamp omit waves with the frequency of 5.26x10^14 Hz. What is the wavelength of light?
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PLEASE HELP ASAP!!!
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what is dimensional analysis
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If an object is placed at distance of 16cm from a plane mirror, How far would it be from it's image?
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The speed of sound through diamond is about 12,000 m/s. The speed of sound through wood is about 3,300 m/s. Which statement explainswhy the speed of sound is different through these materials? (1 point)
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A 125 kg mail bag hangs by a vertical rope 3.3 m long. A postal worker then displaces the bag to a position 2.2 m sideways from its original position, always keeping the rope taut.1) What horizontal force is necessary to hold the bag in the new position?2) As the bag is moved to this position, how much work is done by the rope?3) As the bag is moved to this position, how much work is done by the worker?
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Which of the following requires constant agonist-antagonist muscle contraction
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