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Physics
Physics
High School
The power of a lens is given as 1/f.The units are not in Watts.The units are diopters,1/m.So a lens with a short focal length has the potential to provide more magnification than a lens with a longer focal length.The same is true for mirrors.What is the focal length of a lens with P=+4.0 diopters?What is the focal length of a lens with P=-2.0diopters?
Physics
High School
A spring-loaded gun is cocked by compressing a short, strong spring by a distance d. It fires a signal flare of mass m directly upward. The flare has speed v 0as it leaves the spring and is observed to rise to a maximum height h above the point where it leaves the spring. After it leaves the spring, effects of drag force by the air on the flare are significant. (Express answers in terms of m,v 0,d,h, and g.) (a) How much work is done on the spring during the compression? (b) What is the value of the force constant k ? (c) Between the time of firing and the time at which maximum elevation is reached, how much mechanical energy is dissipated into thermal energy?
Physics
High School
find the maximum fraction of the unit cell volume that can be filled by a diamond lattice
Physics
High School
what is the new orbital speed after friction from the earth's upper atmosphere has done 7.5109j of work on the satellite?
Physics
High School
what are the units of magnetic field? a. dimensionless b. c/s c. tesla d. n/c
Physics
High School
At time t0 (relative to perigee passage), a spacecraft has the following orbital parameters:e = 1.5; perigee altitude = 300 km; i = 35; = 130; and = 115. Calculate r and v at perigee relative to (a) the perifocal reference frame and (b) the geocentric equatorial frame.
Physics
High School
step 3: what is the advantage of reporting the average of several measurements rather than the result of a single measurement?
Physics
High School
A pendulum has a length of 25cm. it is displaced 5 cm from its equilibrium position and the release. It's displacement equation can be analyses as h(t) = A 2t. cos (2t/T). Where A is the amplitude of the pendulum. Recall that the period of a T pendulum is given by the formula T = 2 l/g where T is the period, in seconds, 1 is the length of the pendulum, in meters, and g is the acceleration due to gravity, 9.8m/s. a) Calculate the period of the pendulum, to one decimal place. b) Create a function to model the horizontal position of the pendulum bob as a function of time. c) Create a function to model the horizontal velocity of the pendulum bob as a function of time. d) Create a function to model the horizontal acceleration of the pendulum bob as a function of time. e) Calculate the maximum speed and acceleration of the pendulum bob.
Physics
High School
determine the magnitude p required to displace the roller to the right 0.21 mm .
Physics
High School
when monochromatic light passes through two narrowly spaced slits in phase, there will always be a region of constructive interference on the viewing screen directly between the slits.truefalse
Physics
High School
how does a syn flooding attack cause the victim server to freeze
Physics
College
A short tennis player hits a ball that is r meters from their elbow with an angular acceleration alpha. A tall tennis player hits a ball with the same angular acceleration where the ball is 2, r from their elbow .
Physics
High School
a closed curve encircles several conductors. the line integral around this curve is b dl = 3.56104 tm.
Physics
College
Answer #49 please and thank you
Physics
High School
use cylindrical coordinates. find the volume of the solid that lies within both the cylinder x2 y2 = 25 and the sphere x2 y2 z2 = 100.
Physics
High School
explain the three ways potential reserves can become proven reserves
Physics
High School
etermine whether the sequence is increasing, decreasing, or not monotonic. an = 6ne5n
Physics
High School
determine the magnitude and direction of the force between two parallel wires 15 m long and 5.0 cm apart, each carrying 15 a in the same direction.
Physics
High School
An airplane is travelling N60W at an airspeed of 600 km/h when it encounters a wind blowing from a bearing of 200 at 70 km/h. Determine the resultant velocity of the airplane. [SA]
Physics
High School
determine , the sum of the torques on the seesaw. consider only the torques exerted by the children. express your answer in terms of w , w , l , and l1 .
Physics
High School
on all normal curves the area between the mean and 1 standard deviation will be
Physics
High School
a ball is thrown vertically upward with a speed of 30.0 m/s. how long does it take to reach its highest point?
Physics
High School
how much energy is stored in a 2.60-cm-diameter, 14.0-cm-long solenoid that has 150 turns of wire and carries a current of 0.750 aa
Physics
High School
An electron acquires 5.701016 JJ of kinetic energy when it is accelerated by an electric field from plate A to plate B. What is the potential difference between the plates? Express your answer to three significant figures and include the appropriate units.
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