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Rob and Dave run a 100-m race, crossing the finish line in a dead heat, both taking 10.0s. They each accelerate uniformly, but Rob takes 2.00s to reach his max speed, while dave takes 3.00s. Each ma
A pelican flying along a horizontal path drops a fish from a height of 5.4m. The fish travels 8.0m horizontally before it hits the water below. What is the pelicans speed.
The mass of a star is 1.71·1031 kg and it performs one rotation in 34.1 days. Find its new period (in /days) if the diameter suddenly shrinks to 0.57 times its present size. Assume a uniform
A planet has a single moon that is solely influenced by the gravitational interaction between the two bodies. We will assume that the moon is moving in a circular orbit around the planet and that th
What devices do we call consumers and power source . what parameter characterized the meausre of energy transfer in consumers ? what parameter characterized the ideal source.
Consider a system consisting of 3 charges. A 1 C charge is located at x = 0, a 2 C charge is located at x = 2 cm and -1 C charge is located at x = 5 cm.
What is a catapult ? What is the traditional use of a catapult ? When were catapults in greatest use ? what traditional materials for construction and projectiles are used ? What are some types of
The total volume of a new house is 800 m3. Before the heat is turned on, the air temperature inside is 10°C, and the relative humidity is 50%. After the air is warmed to 20°C, how much wate
A steel cylinder of mass 0.325 kg is tied to a string and allowed to revolve in a circle of radius 1.15 m on a frictionless horizontal table. The other end of the string passes through a hole in the
A daredevil is shot out of a cannon at an angle of 53 degrees with respect to the horizontal. The daredevil has an initial speed of 25 m/s. A net is located at a horizontal distance of 50 m from
Calculate the maximum range when radar operates at 10GHz and has peak power=10 Mwatt,S/N ratio=10dB,antenna cross section=100 mm2,target cross section=10mm2.The gain of transmitting antenna is 15dB
In what way is the NPV consistent with the principle of shareholder wealth maximization? What happens to the value of a firm if a positive-NPV project is accepted? If a negative-NPV project is accep
Solve each equation. Write the missing quantity, the correct unit of measure, and the quantity being measured.
When two light bulbs are connected in series, Bulb A is brighter than Bulb B.If the positions of the bulbs were reversed, which of the following is true:Bulb A would still be brighteror Bulb B woul
The vehicle is used to transport supplies to and from the bottom of the 25-present grade. Each pair of wheels, one at A and the other at B, has a mass of 140 kg with a radius of gyration of 150 mm.
A car starts at rest. it then accelerates at a rate of 1.3 m/s [East] for 8.2 seconds. If itcontinues as this new velocity for 12 more seconds, what will the displacment of the new car be during th
A car accelerates from 23 m/s to 28 m/s while travelling a distance of 1.97 m due to a 97800-N net force acting on it. How much total work is done on the car? What is the mass of the car?
A ballet director assigns slow, graceful steps to larger dancers, and quick movements to smaller dancers. Why is this plan successful?
A roller coaster travels 41.1 at an angle of 40 degrees above the horizontal. How far does it move horizontally and vertically?
In exploring the Doppler effect, we learned that sound from approaching or receding sources can seem higher or lower in pitch. When the engineer of a train blows the whistle, does he or she hear any
Train engine has a mass of 2.1 x 10^7 and is moving acrossed a bridge at 23.9 miles per hour what is the kinetic energy?
An object weighs 30 N. How would you explain this statement according to what you know about mass and acceleration due to gravity?
Suppose a 29.9-kg child sits 1.27 m to the left of center on the same seesaw as the problem you just solved in the PRACTICE IT section. A second child sits at the end on the opposite side, and the
A wooden box on a wooden table is pulled at constant speed by a 10N force at a 30 degree angle. What is the mass of the box?
A birthday cake candle 4 cm high is 10 cm from a converging lens whose focal length is 15 cm. Use a ray diagram on a suitable scale (say, 1/3 full size) to find the location of the image, its hiegh