Physics Work,Power & Energy Level: Misc Level
A 0.246 kg puck, initially at rest on a horizon-tal, frictionless surface, is struck by a 0.169 kg puck moving initially along the x axis with a speed of 2.2 m/s.After the collision, the 0.169 kg puck has a speed of 1.2 m/s at an angle of 38 degrees to the positive x axis. Determine the velocity of the 0.246 kg puck after the collision. Answer in units of m/s.
Physics Work,Power & Energy Level: Misc Level
A 2123 kg car moving east at 10.64 m/s col-lides with a 3204 kg car moving north. The cars stick together and move as a unit after the collision, at an angle of 38.1 degrees north of east and at a speed of 5.39 m/s.What was the speed of the 3204 kg car before the collision? Answer in units of m/s.
Physics Work,Power & Energy Level: Misc Level
Two particles, of masses m and 4 m, are mov-ing toward each other along the xi axis with the same initial speeds of 7. 76 m/s. Mass m is traveling to the left, and mass 4 m is trav- eling to the right. They undergo a head-on elastic collision, and each rebounds along the same line as it approached. Find the final speed of the hevier particle.Answer in units of m/
Physics Force & Laws Of Motion Level: Misc Level
A machine gun fires 20.9 g bullets at a speed of 322 m/ s.The gun fires 306 bullets/min. What is the average force the shooter must exert to keep the gun from moving? Answer in units of N.
Physics Force & Laws Of Motion Level: Misc Level
A (n) 696 N man stands in the middle of a frozen pond of radius 10.4 m. He is un- able to get to the other side because of a lack of friction between his shoes and the ice.To overcome this difficulty, he throws his 1.2 kg physics textbook horizontally toward the north shore, at a speed of 5.5 m/s. The acceleration of gravity is 9.81 m/s squared. How long does it take him to reach the south shore?Answer in units of s.
Physics Force & Laws Of Motion Level: Misc Level
You want to enlarge a skating surface so you stand on the ice at one end and aim a hose horizontally to spray water on the schoolyard pavement. Water leves the hose at 3. 9 kg/s with a speed 19. 8 m/s. If your mass is 81 kg, what is your recoil acceleration? Neglect friction and the mass of the hose. Answer in units of m/s squared.
Physics Measurements Level: Misc Level
Verify the product rule in the case of a ratio x/y by dividing both sides of equation (11) by z=x/y.
Physics Measurements Level: Misc Level
Eualuate z, and write the ualue of z with its uncertainty, using the correct number of significant figures. Is z most sensitive to the uncertainty in the measurement of x or of y? Explain.
Physics Measurements Level: Misc Level
Bob measures the side length of a cube, obtaining a ualue of 2.5 cm. Assuming this value is correctly rounded off, what is its uncertainty?Calculate the volume of the cube, with its uncertainty. Calculate also the relative uncertainty in the volume, given as a percentage.
Physics Measurements Level: Misc Level
What is the relative uncertainty in the measured diameter?
Physics Measurements Level: Misc Level
Bob weighs himself in the morning on a digital scale (calibrated in pounds), shown in the picture below .What is the uncertainty in his measurement? What is the relative uncertainty in Bob ,s weight, expressed as a percentage of his weight?
Physics Measurements Level: Misc Level
Given a sheet of paper and a ruler, can you think of two indirect measurements you could make?What direct measurements would you need in each case?
Physics Measurements Level: Misc Level
Alice measures the diameter of a CD and gets a value of 117 mm, so she reports the value of the circumference as 367.5663404700058 mm, What ,s wrong with this picture?
Physics Measurements Level: Misc Level
The minute hand and hour hand of an anglog clock coincide at 12;00;00.Determine (up to the second) all times when these two hands are at right angles. Put final results in a neat table. Need work and solution*
Physics Gravitation Level: Misc Level
Four identical point particles(each having massm+5000 kg) are located at the points (-2,0), (0,8), (6,0) and (0,3) in the xy plane. All positions are measured in meters. Determine the magnitude of the total gravitational force on the particle located at(6,0)due to the other three particles.**Need work and solution*
