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Mechanics | Relativity
Metabolizing a candy bar releases about 10^6 joules. How fast must the candy bar travel to have the same 10^6 joules in kinetic energy? The mass of the candy bar is 0.2 kilograms.
Mechanics | Relativity
What is the minimum speed of a roller coaster at the top of a 39.0 meter tall vertical loop if the passengers are "weightless" at that point?
Mechanics | Relativity
What is the maximum speed with which a 1050 kg car can round a turn of the radius 70 m on a flat road if the coefficient of friction between tires and road is 0.80?
Mechanics | Relativity
The water flow through the turbine of a hydropower plant is
660 m^3/min, and the vertical height from the tail water level to the intake water level is 14 m. The efficiency of the power plant is 86 %, which means that the power plant converts 86 percent of the change in the potential energy of the water into electrical energy. How much power does the hydropower plant deliver to the grid? (g= 9.8 m/s)
660 m^3/min, and the vertical height from the tail water level to the intake water level is 14 m. The efficiency of the power plant is 86 %, which means that the power plant converts 86 percent of the change in the potential energy of the water into electrical energy. How much power does the hydropower plant deliver to the grid? (g= 9.8 m/s)
Mechanics | Relativity
A sound wave traveling at 342 m/s is emitted
by the foghorn of a tugboat. An echo is heard
3.60 s later.
How far away is the reflecting object?
Answer in units of m.
by the foghorn of a tugboat. An echo is heard
3.60 s later.
How far away is the reflecting object?
Answer in units of m.
Mechanics | Relativity
A car moving westward along a straight, level road increases its velocity uniformly from +19 m/s to +35 m/s in 10.2 s.How far did it move while accelerating? Answer in units of m.
Mechanics | Relativity
Water waves in a lake travel 4.73 m in 1.01 s. The period of oscillation is 1 s. What is the speed of the water waves? Answer in units of m/s.
Mechanics | Relativity
The weight of water provided the force on the wheel to turn the axle. If the axle provides 3750N of force, and the effective weight of the water can provide a tangent force on the wheel of 325N, what is the minimum radius of the wheel if the axle radius is 55 cm.
Mechanics | Relativity
Earthquakes produce two kinds of seismic
waves: he longitudinal primary waves (called
P waves) and the transverse secondary waves
(called S waves). Both S waves and P waves
travel through Earth’s crust and mantle, but
at different speeds; the P waves are always
faster than the S waves, but their exact speeds
depend on depth and location. For the pur-
pose of this exercise, we assume the P wave’s
speed to be 9620 m/s while the S waves travel
at a slower speed of 5990 m/s.
If a seismic station detects a P wave and
then 31.6 s later detects an S wave, how far
away is the earthquake center?
Answer in units of km.
waves: he longitudinal primary waves (called
P waves) and the transverse secondary waves
(called S waves). Both S waves and P waves
travel through Earth’s crust and mantle, but
at different speeds; the P waves are always
faster than the S waves, but their exact speeds
depend on depth and location. For the pur-
pose of this exercise, we assume the P wave’s
speed to be 9620 m/s while the S waves travel
at a slower speed of 5990 m/s.
If a seismic station detects a P wave and
then 31.6 s later detects an S wave, how far
away is the earthquake center?
Answer in units of km.
Mechanics | Relativity
A harmonic wave is traveling along a rope. It is observed that the oscillator that generates
the wave completes 40.2 vibrations in 33.7 s. Also, a given maximum travels 438 cm alongthe rope in 11.7 s.
What is the wavelength?
Answer in units of cm.
the wave completes 40.2 vibrations in 33.7 s. Also, a given maximum travels 438 cm alongthe rope in 11.7 s.
What is the wavelength?
Answer in units of cm.
