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A ray of light makes an angle of 35ΓΈ with a plane mirror .what is the angle of reflection
Someone takes 15 minutes to walk up a hill 100m high.His weight is 600N.a)How much work did he do in climbing the hill?
B)what power is developed by his muscles as he climb s?
C)If he climbs up the hill,his muscles can exert 600watts.How long will it take him to getto the top of the hill.
three particles of the respective masses m1-12kg,m2-24kg, and m3-36kg formed an equilateral triangle of side length a=120cm.If we locate m1 at the origin of the xy-plane and put m2 to right of m1 at right axis.What is the approximate coordinate s of the center of the mass of the system?
determine the value of E in a material for which the electric susceptibility is 3.5 and p = 2.3 x 10 x 87 C/m^2
The frequency range of audible sound is [Best
answerl.
A. lower than 20 Hz.
B. lower than 20 KHz.
C. between 20 Hz to 20 KHz.
D. greater than 20 MHz.
Air is compressed in a diesel engine from an initial pressure of 13 psia and a temperature of 120 F to one-twelfth of its original volume. Calculate the final temperature assuming the compression is adiabatic
an isentropic compression process, air is compressed to an initial pressure of 100 psi to 200 psi. What is the final volume in cubic inches if the initial volume is 10 in^3?
[Best answer] is NOT electromagnetic wave.
A. Light
B. Microwaves
C. X-rays
D. Sound wave
In a Bangladesh-Australia cricket match, Sakib Al Hasan throws a ball towards the batsman. The ball starts to spin with 18.0 rev/s. The radius of the ball is 7.1cm. (a) Find the tangential speed of the outer periphery of the ball as it spins. (b) What is the centripetal acceleration of the cricket ball? (c) Letβs consider, due to air friction, the spin of the ball decays at the rate of 0.6 rev/s2 . Now find how long it will take for the ball to stop spinning and the total angle through which it will rotate during this time. (Consider the rate as constant)
1. The position of a particle which moves along the straight line is define by the relation π₯(π‘) = π‘^3 β 6π‘^2 β 15π‘ + 40 where π₯ and π‘ are expressed in meters and seconds respectively. Note that the coefficients of t have dimensions accordingly. (a) Determine when the velocity of the particle is zero. (b) Calculate the position vector and distance travelled by the particle when the acceleration is zero. Consider that at the starting point time π‘ = 0 sec. (c) Does the particle move at constant velocity or constant acceleration? Justify your answer
