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A cameraman on a pickup truck is traveling westward at 24 km/h while he videotapes a cheetah that is moving westward 25 km/h faster than the truck. Abruptly, the cheetah stops, turns, and then run at 42 km/h eastward, as gauged by a suddenly nervous crew member who stands alongside the cheetah's path. The change in the animal's velocity takes 2.3s. What are the (a) magnitude of the cheetah's acceleration according to the cameraman and the (b) magnitude of the cheetah's acceleration according to the nervous crew member?
A 100-kW radio station emits EM waves in all directions from an antenna on top of a mountain. What is the intensity of the signal at a distance of 10 km?
A cyclotron particle accelerator (sometimes called an "atom smasher" in the popular press) is a device for accelerating charged particles, How fast are these protons moving when they hit the tumor
A wall is composed of two materials, material 1 has a thickness of 3.68 cm and a thermal conductivity of 0.1 J/msCo while material two has a thickness of 6.02 cm, what is the energy loss per second to the nearest watt
assume the mass of cart 1 is m1 = 234 g and the mass of cart 2 is 181 g. Calculate the energy lost in the collision
The other end is attaced to a 3 kg disk moving in uniform circular motion on the table, which stretches the spring by 1 cm. Note: Friction is negligibe. Illustrate what is the work done on the disk by the spring during one full circle?
a certain orthodontist uses a wire brace to align a patients crooked tooth as in the figure below. the tension in the
A 82 kg cross-country skierglides over snow as in Figure P11.25. The coefficient of frictionbetween skis and snow is 0.40. Assumeall the snow beneath his skis is at 0°C and that all theinternal energy generated by friction is added to snow, whichs..
A 64g bullet traveling at 250 m/s penetrates a block of ice at 0 C and comes to rest within the ice. how much ice is melted as a result of the collision
At t=0 a grinding wheel has an angular velocity of 25 rad/s. It has a constant angular acceleration of 35.0 rad/s^2 until a circuit breaker trips at time t = 2.10 s. From then on, it turns by an angle 431 rad as it coasts to a stop at constant ang..
Assume a car's brakes can produce an acceleration of -7 m/s2. If the car is travelling at an initial speed of 28.0m/s, what is the minimum distance necessary to stop car.
A wire is bent to form a circle whose diameter is 10cm. Find the maximum torque that the magnetic field can exert on the wire
Two polarizers are aligned to the angle between their polarization direction is 45 degrees. what fraction of the incident intensity is transmitted though the second
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