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An airplane is flying at v=100m/s along the straight line at an altitude h=5000m. At the instant when it is over an anti-aircraft battery, a rocket is fired at 500m/s to bring the plane down. A. Fi
A train is traveling at 30.0 relative to the ground in still air. The frequency of the note emitted by the train whistle is 262 . The speed of sound in air should be taken as 344 . What frequency is
If the local atmospheric pressure is 101 kPa and acceleration due to gravity, g is 9.81 m/s^2, determine the height of the mercury column in a barometer, L in "mm Hg" and in "inch Hg".
The water gradually descends 7 m as the pipe increases in area to 8.2 cm2. (a) What is the speed at the lower level? 2.46m/s (b) If the pressure at the upper level is 2.0x10^5Pa, what is the pressur
Question: An object weighing 335 N in air is immersed in water after being tied to a string connected to a balance. The scale now reads 265 N. Immersed in oil, the object weighs 285 N. (a) Find the
An empty rubber balloon has a mass of 0.0115 kg. The balloon is filled with helium at a density of 0.181 kg/m3. At this density the balloon is spherical with a radius of 0.400 m. If the filled ballo
Question: A small ferryboat is 4.00 m wide and 6.00 m long. When a loaded truck pulls onto it, the boat sinks an additional 4.80 cm into the water. What is the weight of the truck?
A container is filled to a depth of 20.0 cm with water. On top of the water floats a 35.0 cm thick layer of oil with specific gravity 0.900. What is the absolute pressure at the bottom of the conta
A 43.0 kg ballet dancer stands on her toes during a performance with four square inches (26.0 cm2) in contact with the floor. What is the pressure exerted by the floor over the area of contact in th
Given the heat of fusion and specific heat of this metal is 80.18 kJ/kg and 373 J/kg°C, respectively, determine the amount of thermal energy absorbed by the sample before reaching thermal equili
The second submarine is required to travel at a constant velocity, so the captain needs to determine the magnitude of that velocity. Draw a picture of the problem.
Assuming no heat loss to the surrounding environment, determine the minimum duration of time necessary for a 100 W aquarium tank heater to raise the temperature of 20.0 gallons of water by a differ
You are a part of a citizen's group evaluating the safety of a high school athletic program. To help judge the diving program you would like to know how fast a diver hits the water in the most compl
A person scuffing her fee on a dry day accumulates a net charge of -42 uC. How many excess electrons does she get, and by how much does her mass increase?
Charges of 4.0 µC and -6.0 µC are placed at two corners of an equilateral triangle with sides of 0.10 m. At the third corner, what is the electric field magnitude created by these two c
Question: Calculate the electric field at the center of a square 53.7 cm on a side if one corner is occupied by a +38.5 µC charge and the other three are occupied by -29.4 µC charges.
A cyclist riding this bike increases her pedaling rate form 60 rpm to 90 rpm in 10 s. What is the tangential acceleration of the pedal?
What must be the potential difference across the plates of the capacitor filled with a dielectric so that it stores the same amount of electrical energy as the empty capacitor?
Their angular speeds are 1.90 x 10-3 rad/s and 3.10 x 10-3 rad/s, respectively. How much time elapses before they meet? Find its angular speed 1.00 s after this process begins.
Question: An auto race is held on a circular track. A car completes one lap in a time of 19.3 s, with an average translational speed of 45.2 m/s. What is the radius of the track, and what was the c
Question: A wheel centered at the origin turns through a displacement of -8.00 radians. A bug riding on the wheel rim starts this trip on the +x-axis. Find its final angular position, in degrees ab
Question: An office window has dimensions 3.4 m by 1.7 m. As a result of the passage of a storm, the outside air pressure drops to 0.95 atm, but inside the pressure is held at 1.0 atm. What net for
A 75.0 kg patient is running a fever of 105°F and is given an alcohol rub to lower the body temperature. If the specific heat of the human body is approximately 0.830 kcal/kg°C and the heat