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A suspicious-looking man runs as fast as he can along a moving sidewalk from one end to the other, taking 4.00 s. Then security agents appear and the man runs as fast as he can back along the sidewalk to his starting point, taking 12.5 s. What is the ratio of the man's running speed to the sidewalk's speed? (running speed / sidewalk speed)
The reflected sound is afterwards mixed with the transmitted sound, and 85 beats per second are detected. The speed of sound in body tissue is 1520m/s. compute the speed of the fetal heart wall at the instant this measurement is made.
A jet aircraft with a mass of 4,675 kg has an engine that exerts a force (thrust) equal to 60,100 N. what is the jet's acceleration
A gnat takes off from one end of a pencil and flies around erratically for 18.1 seconds before landing on the other end of the same pencil. find the gnat\'s average speed
Two blocks of masses m1 and m2 are connected by an ideal string passing over an ideal pulley. Find a relation between the variables that would guarantee that the block is initially slowing down
You pull downward with a force of 32 N} on a rope that passes over a disk-shaped pulley of mass 1.2 kg and radius 0.07 5m. Find the linear acceleration of the 0.61 kg mass.
Consider two solid conducting spheres of radii r1 = 2 cm and r2 = 3 cm. Sphere 1 initially carries a net charge of +6 ?C, What is the voltage at the surface of sphere 1? What is the net charge on sphere 1? On sphere 2
If a bullet is fired vertically upwards with the speed calculated in (b), what is the maximum height that the bullet can reach.
A piece of Nichrome wire has a radius of 5.00 x10-4 m. It is used in a laboratory to make a heater that uses 2.00 102 W of power when connected to a voltage source of 120 V. Ignoring an effect of temperature on resistance, estimate the necessary l..
Froima plotted graph a student determined that the best fit line had a slope of 1.227m/s^2 and a y-interecept of 0.32m/s. Determine the uncertainty for the slop of the line
A horizontal circular platform rotates counterclockwise about its axis at the rate of 0.877 rad/s. You, with a mass of 70.5 kg, compute the total angular momentum of the system
How much work does Bob do on the rock and How much force, assumed to be constant, does Bob apply to the rock
An object is placed 2.0 cm from a converging lens with focal length 1.5 cm. Determine the location of the final image
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