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1. In order to qualify for the finals in a racing event, a race car must achieve an average speed of 250 km/h on a track with a total length of 1 600 m. If a particular car covers the first half of the track at an average speed of 230 km/h, what minimum average speed must it have in the second half of the event in order to qualify?
2. Runner A is initially 4.0 mi west of a flagpole and is running with a constant velocity of 6.0 mi/h due east. Runner B is initially 3.0 mi east of the flagpole and is running with a constant velocity of 5.0 mi/h due west. How far are the runners from the flagpole when they meet?
A satellite moves in a circular orbit around Earth at a speed of 4439 m/s. Determine the period of the satellites orbit
An early main objection to the idea that Earth is spinning on its axis was that Earth would turn so fast at the equator that people would be thrown off into space. Show the error in this logic with calculating The weight of the person and The centrip..
A solar concentrating heat exchanger system directs sunlight onto a long,straight pipe. The pipe recieves 153.616 btu/h per foot of length. What is the entropy production
A 2.40 H coil with a resistance of 3.95×10^2 Ohm is in series with a 4.86×10^3 Ohm resistor. What is the peak value of the potential difference across the coil
question a styrofoam box has a surface area of 0.81 m2 and a wall thickness of 2.0 cm. the temperature of the inner
An 800 g steel plate has the shape of the isosceles triangle shown in the figure(Figure 1) . The hieght of the triangle is 30 cm and th base is 20 cm. What is the x-coordinates of the center of mass?
a 0.150 kg particle moves along an x axis according to xt -13.00 2.00t 4.50t2 - 3.50t3 with x in meters and t in
What is the electric field strength between the disks. What is the speed of the box at the end of the 5.7-s interval.
An ant’s position is described as follows: r = (2t^3 - 6t^2) *i + (-3t^4 + 2t) *j a. What are the x- and y-components of the position at t = 0s? b. What are the x-and y-components of the velocity at t = 1s? c. What is the magnitude of the velocity at..
you are driving along a highway at 28.8 ms when you hear a siren. you look in the rear-view mirror and see a police car
Assuming that the ball's initial velocity was 45° above the horizontal and neglecting air resistance, what does the initialspeed of the ball need to be to produce such a home run if the ballis hit at a point 1.0 m(3.3 ft) above ground level? Assum..
A simple pendulum is made from a 0.691-m-long string and a small ball attached to its free end. how much time elapses before it attains its greatest speed
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