Physics

A pen contains a spring with a constant of 216 N/m. When the tip of the pen is in its retracted position, the spring is compressed 4.10 mm from its unstrained length. In order to push the tip out and lock it into its writing position, the spring must be compressed an additional 6.10 mm. How much work is done by the spring force to ready the pen for writing? Be sure to include the proper algebraic sign with your answer.
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The fact that the galaxies are rotating at about the same velocity from the center to the edge as opposed to faster near the centers is evidence that. a. There must be more gravity than that calculated from normal Mass b. They are rotating slower over time c. Dark energy is pulling on them d. They are measuring the velocities incorrectly
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Running with an initial velocity of 10.2 m/s m / s , a horse has an average acceleration of -1.77 m/s2 m / s 2 . how much time does it take for the horse to decrease its velocity to 6.1 m/s m / s ?
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An electron traveling with speed v around a circle of radius r is equivalent to a current of:evr/2ev/rev/2r2er/v2ev/r
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If three crests pass Pin in one second, the wavelength is?
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The diffraction grating has 50 slots per millimeter. At what angle isthe maximum of the first row seen when a wavelength of 400 nmfalls perpendicular to the grid?Please I really need your help
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Microwaves can be used to cook food. If a microwaveoven uses waves that are 1 cm (0. 01 m) long, what is thefrequency of these waves?
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The stress on a wire that support a load depend on?
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Particles q1, 92, and q3 are in a straight line.particles q1 = -1.60 x 10-19 c, 92 = +1.60 x 10-19 c,and q3 = -1.60 x 10-19 c. particles 91 and q2 areseparated by 0.001 m. particles q2 and q3 areseparated by 0.001 m. what is the net force on 92?remember: negative forces (-f) will point leftpositive forces (+f) will point right-1.60 x 10-19 c+1.60 x 10-19-1.60 x 10-19 c91+ 92930.001 m0.001 m
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A certain one-dimensional conservative force is given as a function of x by the expression F = -kx^3, where F is in newtons and x is in meters. A possible potential energy function U for this force is
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How much work is done on a block if a 20-N forces is applied to push the block across a frictional surface at constant speed for a displacement of 5. 0 m to the right
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3. You may have seen this question previously but now you will approach it using energyconcepts.A pair of sleds weighs 25 kg and experience a frictional force of 25 N. If a dog team applies a175 N force pulling it 12 m find:a) the work done by friction.b) the work done by the dog team.c) the net work done (using the net force). How does then net work compare to the answersfrom the previous two parts of the question?d) What form of energy does the frictional force represent? What form of energy does the netforce produce?
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What was 15 A pendulum bob has a mass of 1 kg. The length of the pendulum is 2 m. The bob is pulled to one side to an angle of 10 from the vertical. A) What is the velocity of the pendulum bob as it swings through its lowest point? b) What is the angular velocity of the pendulum bob?
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Recently scientist have managed to indirectly observe a super massive black hole in the center of our galaxy. using your imagination and what we have discussed in class, what do you imagine itll be like on the other side of the event horizon?
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A tourist follows a passage which takes her 160 m west, then 180 m at an angle of 45. 0 south of east and finally 250 m at an angle 35. 0 north of east. The total journey takes 12 minutes. a. Calculate the magnitude of her displacement from her original position. (4)b. She measures the distance she has walked to a precision of 5%. She times her total journey to 20 s. (i) What is her average speed?(ii) What is the absolute uncertainty on her absolute speed?
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A woman of mass 50 kg runs up a 300m high hill in 5 min. Her power is:a) 150 Wb) 500 Wc) 100 Wd) 50 We) 300 J
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Four point masses 2kg, 4kg, 6kg and 8kg are placed at the corners of Square ABCD of 2cm long respectively. Find the Position of centre of mass of the system from the corner A.please help me I give you 50 coins
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Economics NCS Topic Test No 5. Perfect Market 1.3. Give ONE term for each of the following descriptions. Write uonly the term next to the question numbers (1.3.1 to 1.3.5) in the ANSWER BOOK. Abbreviations, acronyms and examples will NOT be accepted. 1.3.1 Actual expenditure of business such as wages and interest 1.3.2 The cost that changes as more or less outputs are produced 1.3.3 An institution that can make final decisions by reviewing the decisions of the competition commission and Tribunal. 1.3.4 A word that describe the characteristics of differentiated product in oligopoly or monopolistic competition. 1.3.5 A period when inputs or factors of production are fixed. (5x1) (5) TOTAL SECTION A: [201
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A pendulum is constructed from a thin, rigid, and uniform rod with a small sphere attached to the end opposite the pivot. This arrangement is a good approximation to a simple pendulum (period = 0. 65 s), because the mass of the sphere (lead) is much greater than the mass of the rod (aluminum). When the sphere is removed, the pendulum no longer is a simple pendulum, but is then a physical pendulum. What is the period of the physical pendulum?
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an electrolytic cell is defined as: group of answer choices a cell in which a nonspontaneous reaction produces an electric current a cell in which an electric current drives a nonspontaneous reaction no correct answer a cell in which a spontaneous reaction produces an electric current a cell in which an electric current drives a spontaneous reaction
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PROBLEM SOLVING1. An electron is traveling to the north with a speed of 3. 5 x 106 m/s when a magnetic field is turned on. The strength of the magnetic field is 0. 030 T, and it is directed to the left. What will be the direction and magnitude of the magnetic force?2. The Earth's magnetic field is approximately 5. 9 10-5 T. If an electron is travelling perpendicular to the field at 2. 0 105 m/s, what is the magnetic force on the electron?3. A charged particle of q=4C moves through a uniform magnetic field of B=100 F with velocity 2 x 103 m/s. The angle between 30o. Find the magnitude of the force acting on the charge. 4. A circular loop of area 5 x 10-2m2 rotates in a uniform magnetic field of 0. 2 T. If the loop rotates about its diameter which is perpendicular to the magnetic field, what will be the magnetic flux?
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Help. Dont mind the highlighter answers i dont know if there right
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A ball of mass 200g falls freely under gravity from a height of 50m. find the time taken to fall through a distance of 30m. given that the acceleration due to gravity g = 10m/s^2.
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what would have to be the mass of this asteroid, in terms of the earth's mass m , for the day to become 28.0% longer than it presently is as a result of the collision? assume that the asteroid is very small compared to the earth and that the earth is uniform throughout.
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