How can you manage to skip a flat stone over water? How can you increase the number of skips? Explain how this works and how it was used in WW2 in a squadron called the Dam Busters?
How can you manage to skip a flat stone over water? How can you increase the number of skips? Explain how this works and how it was used in WW2 in a squadron called the Dam Busters?
When a ball moves slowly is experiences laminar flow but when it moves fast there is turbulent airflow. What does this mean? What is the Reynolds number? Why are their dimples on a golf ball...
Mud is thrown off the rim of a wheel of radius a, on a car travelling with speed v. Show that if v2 ≥ ga then no mud can be thrown higher than a + v2 / 2g +ga2/2v2
a) At what distance from the center of the earth along a line from the earth to the moon, is there no net force on a 10,000kg spacecraft? This is the crossover point at with the attraction to the...
Let us consider an ideal gas in a gravitational field which is uniform with strength g. The gas is trapped in a highly realistic h=10km vertical column of height h with perfectly insulating walls...
find the binding energy in joules of a cobalt atom with 27 protons, 32 neutrons and a mass of 97.958205x10^-27kg
object distance u=(50±0.5) cm and images distance v=(20.1±0.2)cm. to obtain central value is easy. but how to obtain final error in focal lenght. in the book where...
i am not sure on how to solve this problem. I've tried solving for R by taking 50/2.1 and then using the formula P=I^2(R) but it did not work.
I've tried using the formula RMS current^2 X the resistor but it did not work. I am not sure how to solve this one.
Physics students make up the lion's share of my current teaching efforts here at Wyzant. I've stuck mostly to AP and the first-year undergraduate level of physics, specifically in the non-calculus-based version of physics. For non-calc physics, the mathematical skills required are surprisingly low. Since students at that level are rarely (if ever) asked to derive or define equations,... read more
A box is pulled at a constant speed by the little engine. The box moves a distance of 3 m across the horizontal surface. (μk=0.20) If 7938 joules of work is transferred, what is the mass...
A 673 kg roller coaster car traveling at 8.2 m/s reaches the bottom of a hill. In order for the ride to work properly, it needs to have a speed of at least 3 m/s at the top of the hill. (Assume negligible...
Jimmy is sitting in a box on wheels at the top of a hill. If Jimmy and the box both have a mass of 246 kg and the the hill at location A is 97m high. When Jimmy gets to the bottom of the first...
If a car has 53 J of kinetic energy, what will its new kinetic energy be if you double its speed? How will the kinetic energy of the car change if you speed of the car is reduced to 1/3 of its...
A roller coaster's highest hill is always the first one. This is because friction pulls energy out of the coaster as it moves along a track. If the highest hill of a particular roller coaster is 16...
A certain radio station broadcasts at 101.5 megahertz. This is the frequency of oscillation of electrons in the transmitting antenna producing the radio wave. Find the period of the electrons' motion...
A uniform rectangular sign of width 53.4 cm, height 31.4 cm, and negligible thickness hangs vertically from supporting hinges attached at its upper edge. Find the period of small-amplitude oscillations...
Document 85k
Derivation of the moments of inertia for both a disk and a solid sphere.
Suppose that by stirring 495 g of water you are able to increase its temperature from 19.0° C to 21.0° C. Find the increase in the water's entropy. answer in J/K
A car of mass 1.31* 10^3 kg is initially moving on a level road at a speed of 16.0 m/s. Compute the increase in temperature of the brakes, assuming that all the mechanical energy ends up as internal...