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The average horsepower required to raise a 150 kg drum to a height of 20 m in a time of 1 minute is.
a. 0.5 Hp
b. 1 Hp
c. 0.7 Hp
d. 1.2 Hp
A worker pushes a wood crate of mass 14 kg across a concrete floor with a constant horizontal force of magnitude 40N. In a straight-line displacement of magnitude d= 0.50 m, the speed of the crate decreases from 0.60 m/s to 0.20 m/s.
Find the following:
a. Work done by the worker’s force.
b. Change in the kinetic energy of the crate.
c. Increase the thermal energy of the crate and the floor.
During the Physics lab, Jerome runs up the stairs, elevating his 102 kg body a vertical distance of 2.29 meters in a time of 1.32 seconds at a constant speed.
a. Determine the work done by Jerome in climbing the staircase.
b. Determine the power generated by Jerome.
a wave travels in the x-direction its displacement y at point x in time t is y=0.1 sin (5x-6t) Its wavelength is? (a) π/5 (b) 2π/5 (c) π/2 (d) 5π/6 (e) 5π/3
a conducting cylinder of radius 3.25 cm and length 5.6 cm has a total charge of 4.5 x 10 c distributed uniformly on its surface area. find the potential at a) its surface, and b) 2.5 cm and c) 5.0 cm from the center of the cylinder.
A turtle crawls along a straight line, which we will call the x-axis with the
positive direction to the right. The equation for the turtle’s position as a function of time is x(t) = 51.0 cm +
(2.50 cms) t − (0.0623 cms2) t2
a.)At what time t is the velocity of the turtle zero?
(b) How long after starting does it take the turtle to return to its starting point?
(c) At what times t is the turtle a distance of 0.1 m from its starting point? What is the velocity (magnitude and direction) of the turtle at each of these times?
10m of rope has a mass of 2.0kg. When the speed of transverse waves along the rope is 6.0ms^-1 the tension in N is?
(a) 1.2 (b) 7.2 (c) 72.0) (d) 28.8 (e) 2880 answers
E56. The equation y= a sin (wt-kx) represents a sound wave traveling along the x-direction. What is the physical interpretation of the quantities a, y, w, t, and k? Deduce whether the wave is traveling in the positive or negative x-direction.
If a= 2.0*10^-7m, w= 8*10^3 s^-1, and k= 25m^-1 calculate (a) the speed of a particle of the wave, and (b) the maximum speed of a particle of the medium disturbed by the wave.
What is the equation of the reflected wave produced when such a wave strikes a rigid boundary normally? By considering the interference of the two waves, show that the resulting displacement is a stationary wave and deduce the distance between successive nodes.
(c) the following system may be used commercially to measure mass (or weight) (1) if, at the sensor, the maximum measurable deflection is 10mm and k= 10^5 Nm^-1, calculate the maximum measurable mass, Mmax. (2) calculate the frequency of oscillation when Mmax is applied. (3) suggest an improvement to the system to enable many measurement of mass to be made in rapid succession.
A worker pushes a wood crate of mass 23.4 kg across a concrete floor with a constant horizontal force of magnitude 80N. In a straight-line displacement of magnitude d= 1.5 m, the speed of the crate decreases from 0.90 m/s to 0.50 m/s.
Find the following:
a. Work done by the worker’s force.
b. Change in the kinetic energy of the crate.
c. The Increase in the thermal energy of the crate and the floor.
