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There are six characteristics of infectious disease agents which determine whether or not an infectious disease will be transmitted to and infect a host.
A rifle bullet with a muzzle speed of 300 m/s is fired directly into a special, dense material that stops the bullet in 36 cm. Assuming the bullet's deceleration to be constant, what is its magnitu
At the same time, a carefully aimed stone is thrown straight up from the bottom of the cliff with a speed of 25.0 . The stone and ball collide part way up. How far above the base of the cliff does t
A uniform spherical shell of mass 8.50 {rm kg} with diameter 45.0 {rm cm} has four small masses of mass 2.30 {rm kg} attached to its outer surface and equally spaced around it. This combination is
While a parachutist is falling toward the ground, the downward force of gravity is exactly equal to the upward force of air resistance. Describe how/if the velocity of the parachutist changes- and
Assume that the plane reaches the required takeoff velocity at the end of the runway. What is the time t_{rm TO} needed to take off?
The car accelerates with a constant acceleration. It reaches a speed of 16.8 m/s (60.5 km/h) in a distance of 126 m. Calculate the acceleration of the car.
If magnitude of F1 is increased until the object just starts to leave the surface,, what is the magnitude of the acceleration on the mass in m/s^2 at this point?
The potential at the surface of a sphere of radius R is given by V = kcos^2(x) where k is constant. Find the potential inside and outside the sphere as a function of r and x (assuming there is no ch
Tina begins to accelerate at a steady 2.70 m/s^2 at the instant when David passes. How far does Tina drive before passing David? What is her speed as she passes him?
Consider an alcohol and a mercury thermometer that read exactly 0°C at the ice point and 100°C at the steam point. The distance between the two points is divided into 100 equal parts in both
How long is the bridge? Write an equation for the bridge's height. And how far from the center of the bridge are two points if the bridge's height at those points is 30 meters.
A 27 pound meteorite struck a car, leaving a dent 18 cm deep in the trunk. If the meteorite struck the car with a speed of 550 m/s, what was the magnitude of its deceleration, assuming it to be con
A beam of light travels from a medium with an index of refraction of 1.95 to a medium with an index of refraction of 1.30. If the beam refracts at an angle of 23.5° from the normal, at what ang
Find the maximum angle between the string and the vertical:
Calculate the impulse delivered to the ball during impact. If the ball is in contact with the slab for a time of 1.60ms , find the average force on the ball during impact.
When you have traveled only half the distance in part (a), is your speed equal to, greater than, or less than 5.9 m/s? Support your answer with a calculation
The coefficient of static friction between the cubes is 0.71. What is the smallest magnitude that vector P can have in order to keep the small cube from sliding downward?
A straight vertical wire carries a current of 1.60A {rm A} downward in a region between the poles of a large electromagnet where the field strength is 0.565T {rm T} and is horizontal.
It starts at the bottom with initial speed 9.15 m/s, travels up the incline, stops, and slides back to the bottom at final speed 6.90 m/s. Using energy considerations, find: a) the energy used to ov
A 2.50m -long, 500g rope pulls a 7.00kg block of ice across a horizontal, frictionless surface. The block accelerates at 2.30m/s2 . How much force pulls forward on (a) the ice, (b) the rope?
Calculate the tension in a horizontal string that whirls a 1.6-kg {rm kg} toy in a circle of radius 2.0m m when it moves at 3.0m/s m/s on an icy surface
A certain string on a piano is tuned to produce middle C (f = 261.63 Hz) by carefully adjusting the tension is the string. For a fixed wavelength, what is the frequency when this tension is doubled
A weightlifter stands up at constant speed from a squatting position while holding a heavy barbell across his shoulders. Draw a free-body diagram for the weight lifter.
A person eats a dessert that contains 26o Calories. This skin temperature of this individual is 36 degrees Celsius and that of her environment is 21 degrees Celsius. The emissivity of her skin is 0