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Prairie dogs are burrowing rodents. They do not suffocate in their burrows, because the effect of air speed on pressure creates sufficient air circulation. The animals maintain a difference in the shapes of two entrances to the burrow, and because of this difference, the air (ρ = 1.29 kg/m3) blows past the openings at different speeds, as the drawing indicates. Assuming that the openings are at the same vertical level, find the difference in air pressure between the openings.
A street lamp weighs 146 N. It is supported equally by two wires that form an angle of 120° with each other.
If the parachutist comes to rest with fix acceleration over a distance of 0.660 meter, find what force does the ground exerts on her
A simple pendulum consists of a ball connected to one end of athin brass wire. The period of the pendulum is 1.81 s. obtain the change in the period of the heated pendulum
The model airplane in Figure 5.7 is flying at a speed of 14.4 m/s on a horizontal circle of radius 17.2 m. The mass of the plane is 1.19 kg. What is the net work done on the plane
In 1915, Henry Sincosky of Philadelphia suspended himself from a rafter by gripping the rafter with the thumb of each hand on one side and the fingers on the opposite side. Sincosky’s mass was 79 kg. If the coefficient of static friction between hand..
If a 1000 hertz signal has a time base measurement that is off by 15 percent, determine the possible ranges in the value for the period of the signal
an 10-kg ball moving at 22 ms collides elastically and head-on with a second 6-kg ball moving in the opposite direction
A concave spherical mirror has a radius of curvature of 1.3 meter. Evaluate what is the focal length of the mirror
A particular nucleus of the element plutonium contains 94 protons and 150 neutrons. What is the magnitude of the force from the nucleus on a single electron that is at a distance of 0.563 × 10-12 m from the plutonium nucleus.
Suppose the current suddenly increases to 1.55 A in the same direction as before, due to an increase in speed of the bar. Find the emf induced in the rod
Liz rushes down onto a subway platform to find her train already departing. She stops and watches the cars go by. Each car is 8.60 meter long. Evaluate the constant acceleration of the train
A relief airplane is delivering a food package to a group of people stranded on a very small island. What is the speed of the package when it hits the ground in mph
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