4.Athlete MeseretDefar runs at 10m/s. How long will it takes her to go80m?A. 8secB. 6secC. 5secD. 7sec5.Which prefix has the smallest value?A. PicoB. MicroC. NanoD. Tera6.The dimension [ML – 3]represents:A. Velocity B. DensityC. AccelerationD. PressureA bus is moving in a straight line at speed of 20m/s. What time does iTtake to cover 4km?A. 200secB. 300secC. 400secD. 500sec_8.One of the following physical quantities is both vector and derived.A. WorkB. PowerC. ForceD. Pressure9.Which one of the following is the correct system of writing of thenumber 20810000m in scientific notation?A. 2081*10 mB. 20.81*10°m C. 2.81*10’m D. 2.081*10'm

4.Athlete MeseretDefar runs at 10m/s. How long will it takes her to go 80m? A. 8sec B. 6sec C. 5sec D. 7sec _5.Which prefix has the smallest value? A. Pico B. Micro C. Nano D. Tera 6.The dimension [ML – 3]represents: A. Velocity B. Density C. Acceleration D. Pressure 7.A bus is moving in a straight line at speed of 20m/s. What time does i take to cover 4km? A. 200sec B. 300sec C. 400sec D. 500sec 8.One of the following physical quantities is both vector and derived. A. Work B. Power C. Force D. Pressure 9.Which one of the following is the correct system of writing of the number 20810000m in scientific notation? 4. 2081*10 m B. 20.81*10°m C. 2.81*10’m D. 2.081*10'm

4.Athlete MeseretDefar runs at 10m/s. How long will it takes her to go 80m? A. 8sec B. 6sec C. 5sec D. 7sec _5.Which prefix has the smallest value? A. Pico B. Micro C. Nano D. Tera 6.The dimension [ML – 3]represents: A. Velocity B. Density C. Acceleration D. Pressure 7.A bus is moving in a straight line at speed of 20m/s. What time does i take to cover 4km? A. 200sec B. 300sec C. 400sec D. 500sec 8.One of the following physical quantities is both vector and derived. A. Work B. Power C. Force D. Pressure 9.Which one of the following is the correct system of writing of the number 20810000m in scientific notation? 4. 208110 m B. 20.8110°m C. 2.8110’m D. 2.08110'm

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter3: Two-dimensional Kinematics

Section: Chapter Questions

Problem 64PE: (a) Use the distance and velocity data in Figure 3.64 to find the rate of expansion as a function of...

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(a) Use the distance and velocity data in Figure 3.64 to find the rate of expansion as a function of distance. (b) If you extrapolate back in time, how long ago would all of the galaxies have been at approximately the same position? The two parts of this problem give you some idea of how the Hubble constant for universal expansion and the time back to the Big Bang are determined, respectively. Figure 3.64 Five galaxies on a straight line, showing their distances and velocities relative to the Milky Way (MW) Galaxy. The distances are in millions of light years (Mly), where a light year is the distance light travels in one year. The velocities are nearly proportional to the distances. The sizes of the galaxies are greatly exaggerated; an average galaxy is about 0.1 MlY across.
Suppose you drop a rock into a dark well and, using precision equipment, you measure the time for the sound of a splash to return. (a) Neglecting the time required for sound to travel up the well, calculate the distance to the water if the sound returns in 2.0000 s. (b) Now calculate the distance taking into account the time for sound to travel up the well. The speed of sound is 332.00 m/s in this well.
A car is traveling at a speed of 33 m/s. (a) What is its speed in kilometers per hour? (b) Is it exceeding the 90 km/h speed limit?
Tectonic plates are large segments of the Earth's crust that move slowly. Suppose that one such plate has an average speed of 4.0 cm/year. (a) What distance does it move in 1 s at this speed? (b) What is its speed in kilometers per million years?
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A dolphin in an aquatic show jumps straight up out of the water at a velocity of 13.0 m/s. (a) List the knowns in this problem. (b) How high does his body rise above the water? To solve this part, first note that the final velocity is now a known and identify its value. Then identity the unknown, and discuss how you chose the appropriate equation to solve for it. After choosing the equation, show your steps in solving for the unknown, checking units, and discuss whether the answer is reasonable. (c) How long is the dolphin in the air? Neglect any effects due to his size or orientation.
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2. What is the speed of horse in meter per second that runs a distance of 1.2 miles in 2.4 minutes?
A Ferrari moves with rectilinear motion. The speed increases from zero to 60mi/hr in 3.5sec, then decreases to zero in 2sec. Calculate: Acceleration during the first 3.5sec and during the next 2sec (m/s2) The distance travelled in the 5.5sec (m) How long does the car need to go to 50m (sec)
1. Andrew and Kevin decide to try out the physics ideas that they are learning and take their baseball pitching machine and a baseball to a 96 feet tall local building. Based on what they have learned the height, s(t), of a baseball, thrown straight up with an initial speed of 80 feet per second from a rooftop 96 feet high is s(t)=-16t^2+80t+96 where t is the elapsed time that the baseball is in the air. The baseball that is pitched miss the rooftop on their way down and eventually strike the ground. a) What is the average velocity of a baseball from t=0 to t=2 seconds? b) What is the velocity of the baseball 2 seconds after it is thrown? c) After how many seconds will the velocity of the baseball reach zero? d) What is the velocity of the baseball t seconds after it is thrown? e) What is the velocity of the baseball as it passes the roof top on the way down?