Questions asked by Y

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• The speed limit on some interstate highways is roughly 120 km/h. What is this in meters per second?
  
• Solve the following problem using analytical techniques: Suppose you walk 17.5 m straight west and then 24.0 m straight north. How far r you from your starting point, & what is the compass direction of a line connecting your starting point to your final?
  
• The plasma membrane is composed of ___% phospholipids?
  
• A ball's thrown upwards from the roof of a building with a speed of 15 m/s. Velocity of the ball when it's 5 m above the roof?
  
• What if she steps on the opposite side, walking against the motion of the sidewalk, what must be her speed so that she reaches the end of the track in the same time as in part (a)?
  
• At how many revolutions per minute the ride should spin in order for the rider to feel a centripetal acceleration of about 1.5 times Earth’s gravitational acceleration?
  
• A ball is fired at a speed of 8 m/s at 20˚ above the horizontal from the top of a 5 m high wall. How far from the base of the ball will the ball hit the ground? Also calculate the angle below horizontal the velocity vector makes.
  
• Calculate the force on 2 kg block?
  
• Knowing the coefficient of kinetic friction between the two materials (0.03), he quickly calculates the normal force. What is it (in N)?
  
• What Fibrous joint is Syndesmoses?
  
• What joint is Synchondroses?
  
• How long will it take for the heavier mass to reach the floor? What will be the speed of the two masses when the heavier mass hits the floor?
  
• Consider the 65.0 kg ice skater being pushed by two others shown in the figure?
  
• Mary applies a force of 71 N to push a box with an acceleration of 0.54 m/s2. When she increases the pushing force to 80 N, the box's acceleration changes to 0.69 m/s2. (a) What is the mass of the box?
  
• If the horizontal circular path the riders follow has a 7.00 m radius, at how many revolutions per minute will the riders be subjected to a centripetal acceleration whose magnitude is 2.25 times that due to gravity?
  
• Why would tension be smaller if the string were parallel to the lab bench?
  
• A 66.0 kg person climbs stairs, gaining 3.70 meters in height. Find the work done (in J) to accomplish this task?
  
• How much work is done by the boy pulling his sister 36 m in a wagon as shown in the figure below? Assume no friction acts on the wagon. (Assume d = 36 m and F = 52 N.)
  
• A 4.00 ✕ 105 kg subway train is brought to a stop from a speed of 0.500 m/s in 0.600 m by a large spring bumper at the end of its track. What is the force constant k of the spring (in N/m)?
  
• A 60.0 kg skier with an initial speed of 12.0 m/s coasts up a 2.50 m high rise as shown in the following figure. Find her final speed at the top (in m/s), given that the coefficient of friction between her skis and the snow is 0.0800?
  
• Using values from this table, how many DNA molecules could be broken by the energy accumulated from the fusion of all the hydrogen in the oceans on Earth?
  
• How many people would it take to run a 2.00 kW electric clothes dryer?
  
• What would happen? Explain your observations.
  
• Estimate the magnitudes of these quantities?
  
• #30 xx 1.1 + 20 xx (1.1 - x/2) = 40 xx (x - 1.1).# How to solve for #x#?
  
• 1.50 = (2 x 3.14) sqrt(0.480/k)?
  
• 1.90 = (2 x 3.14) sqrt(m'/8.414)?
  
• Max #KE# = #8.189# #J# = # ½ * 7.8# #kg * v^²#?
  
• An object is moving w/constant velocity in a straight line. Which of the following statements is true? *I'm just putting this up for my records.
  
• Which of the following assessments best characterizes clinical application of ultrasonography during the first trimester of pregnancy?
  
• Which type of resolution is half of the spatial pulse length?