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A position-time graph for a particle moving A position-time graph for a particle moving along the x axis is shown in Figure P2.7. (a) Find the average velocity in the time interval t = 1.50 s to t = 4.00 s (b) Determine the instantaneous velocity at t = 2.00 s by measuring the slope […]

Rax compan’ys labor rate variance would be Rax company has developed the following standards for one of its products: Direct Materials 12 Pounds- $14per pound Direct labor 3 hours – $18 per hour Variable overhead 3 hours – $8 per hour the following activities occurrred during the month of october: materials purchased 10,000 pounds at […]

A plane landing on an aircraft carrier has just 70 A plane landing on an aircraft carrier has just 70 m to stop. If its initial speed is 60 m/s, (a) What is the acceleration of the plane during landing, assuming it to be constant? (b) How long does it take for the plane to […]

A proton moves along the x axis according to the A proton moves along the x axis according to the equation x = 50t + 10t2, where x is in meters and t is in seconds. Calculate (a) The average velocity of the proton during the first 3.0 s of its motion, (b) The instantaneous […]

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A particle starts from the origin at t = 0 A particle starts from the origin at t = 0 and moves along the positive x axis. A graph of the velocity of the particle as a function of the time is shown in the figure; the v-axis scale is set by vs = 7.0 […]

A physics teacher performing an outdoor A physics teacher performing an outdoor demonstration suddenly falls from rest off a high cliff and simultaneously shouts “Help.” When she has fallen for 3.0 s, she hears the echo of her shout from the valley floor below. The speed of sound is 340 m/s. (a) How tall is […]

An object is dropped from a height H. During the An object is dropped from a height H. During the final second of its fall, it traverses a distance of 38 m. What was H? Is this the question you were looking for? If so, place your order here to get started!

A fish swimming in a horizontal plane has velocity vi A fish swimming in a horizontal plane has velocity vi = (4.00i + 1.00j) m/s at a point in the ocean where the position relative to a certain rock is ri = (10.0i – 4.00j) m. After the fish swims with constant acceleration for 20.0 […]

A physics professor demonstrates his new “anti-gravity parachute A physics professor demonstrates his new “anti-gravity parachute” by exiting from a helicopter at an altitude of 1500 m with zero initial velocity. For 8 s he falls freely. Then he switches on the “parachute” and falls with a constant upward acceleration of 15 m/s2 until h […]