You are to launch a rocket, from just above the ground, with one of the following initial velocity vectors: (1) V initial= 20i +70j (2)V initial= -20i + 70j (3)V initial = 20i - 70j (4) V initial = -20i-70j. In your coordinate system, x runs along level ground and y increases upward.
Work & Power In Lab 5 involves walking up a flight of stairs and recording your time via a stopwatch or chronograph. You will be asked to make measurements and calculations for the total time to work the flight of stairs (at least 7 steps) and the vertical height of the stairs from the bottom to the top. The lab details follow: Purpose: Determine your work and power as you climb a flight of stairs. Materials: Yardstick, a stopwatch or digital/analog watch, bathroom scale, calculator, and you, the climber Procedure: Estimate your mass in kg (Hint: 1 kg (mass) = 2.2 pounds (weight)). You should approach the bottom step of the stairs with a steady speed. You are to start the time as you reach the first stair and stop the clock when you reach the top Observations and Data: Calculate the work and power for you to climb the flight of stairs Work (you) = _____; power (you) = ________ Calculate your power in kilowatts: (P(kW) = _____. Application: Your local electric company supplies you with 1 kW of power for 1 hour for 8 cents. Assume that you could climb these stairs continuously for 1 hour. How much money would this climb be worth? $_________
The power rating of a resistor is the maximum power the resistor can safely dissipate without too great a rise in temperature and hence damage to the resistor. If the power rating of a 15k? resistor is 5.0 W, what is the maximum allowable potential difference across the terminals of the resistor?
A ball is thrown at a launching angle of 52 degrees above the horizontal from one meter above the ground, with a velocity of 18 m/s. What is the highest barrier the ball can clear?
1.Chapter 3- Logic and Reason or Logic versus Reason? “He/she has a very logical mind- very well suited for studies of science.” Why does such a statement so often heard when guiding a son or daughter to university does not really make sense? Would intuition be a better guide? Discuss. 2.Why don’t we all have the right to judge science and scientists? Why it looks easier to judge a big city mayor than a local pharmacist? Most people feel qualified to make political judgements, debate artistic values or athletic ability but when it comes to science- even science editors can become shy. And so, only scientists are left to judge science and other scientists. Is this really fair? Combine both essays into one file and save your file as "Last name, First name PHYSP20". Make sure you include your name in the file itself as well. Upload your assignment in Word format. Max 1000 words per essay(Min 800). *Text book: The Art of Science by Boris Castel **At least 2 references (hard cover) ***marking rubric is uploaded.
A block of mass m = 5.6 kg, moving on a frictionless surface with a velocity of 6.5 m/s to the right, collides with a block of mass 10.0 kg at rest, as shown in the figure. After the collision, the 5.6-kg block recoils with a velocity of 0.70 m/s to the left. What is the initial velocity of the 10.0 kg bock immediately after the collision?
A stone is catapulted at time t = 0, with an initial velocity of magnitude 20.0 m.s and at an agnel of 40.0degrees above the horizontal. What are the magnitudes of the (a) horizontal and (b) vertical components of its displacement from the catapult site at t = 1.10 seconds ? Repeat for the (c) horizontal and (d) vertical components at t = 1.80 seconds, and for the (e) horizontal and (f) vertical components at t = 5.00 seconds.
Two cars of equal mass collide on a horizontal frictionless surface. Before collision, car A is at rest while car B has a constant velocity of 12m/s. After collision, the two bodies are stuck together. What is the speed of the composite body (A+B) after the collision?
