4) Block 1 of mass 200 kg slides over a frictionless surface with a velocity of 0.25 cm/s and strikes block 2 of mass 100 kg sliding to the left at 0.75 cm/s. What is the final velocity of each block if the collision is
A) Perfectly elastic?
B) Perfectly inelastic?
C) If there is an external force of 4000 kg*cm/s^2 to the right for 0.008 s during the perfectly inelastic collision?
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An empty rubber balloon has a mass of 0.0105 kg. The balloon is filled with helium at a density of 0.181 kg/m3. At this density the balloon is spherical with a radius of 0.300 m. If the filled balloon is fastened to a vertical line, what is the tension in the line?
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You are pushing a 6·kg block across a table so that it is speeding up with an acceleration of 2·m/s2.
(a) What is the net force acting on the block? ______N
(b) In addition to your push, the only other horizontal force acting on the block is friction. If your push has a magnitude of 20·N, what is the magnitude of the frictional force acting on the block? _______N
(c) If you want the block to stop accelerating and instead move
with a constant velocity, what will the magnitude of YOUR force
need to be? _______ N
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-Understand the difference between mass and weight
Without altering their eating habits or exercising, what can a person do to increase or decrease their weight? Mass?
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A frictionless cart of mass ? = 4.00 kg has a shape of a ramp with an incline angle ? = 60.0°. The ramp is pulled by a constant horizontal force ? = 15.0 N. Another frictionless cart of mass? = 2.00 kg can roll along the ramp and is attached to the top of the ramp at point ? by a spring of constant ? = 300. N/m. The spring is free to pivot without friction around point ?. Assume that the motion of the carts has stabilized, i.e. the top cart ? doesn’t oscillate with respectto ramp and the spring maintains a constant amount of stretch. Find acceleration of the carts, normal force between the carts and the amount of stretch of the spring.
Please can you do it step by step, so i can understand what is going on ?
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Relative humidity isn't everything. Why is it that outdoor air of 80 Fo at 55% humidity will feel more “muggy” than a 50 Fo cave at 75% humidity? What other parameter is a better measure of the actual amount of moisture in the air, and how do we define it? Then give two examples of when keeping close track of moisture in the air is important.
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1. A ball of negligible size and a given mass is attached to a vertical spring that obeys Hooke's law. The mass is set in oscillation in a vertical direction. At equilibrium, its position is recorded to be "zero". At what point during the oscillation will the ball-earth-spring system have the maximum elastic potential energy?
| A. The maximum elastic potential energy will only be at the lowest position from the earth during its motion. | ||||||||||||||||||||
| B. The maximum elastic potential energy will only be at the highest position from the earth during its motion. | ||||||||||||||||||||
| C. The maximum elastic potential energy will be at a position between the highest point and equilibrium, and also between the lowest position and equilibrium. | ||||||||||||||||||||
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D. The maximum elastic potential energy will be both at the highest position and lowest position from the earth during its motion. |
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E. The maximum elastic potential energy will only be at the equilibrium position during its motion. 2. A ball of negligible size and a given mass is attached to a vertical spring that obeys Hooke's law. At equilibrium, its position and gravitational potential energy is chosen to be "zero". The mass is set in oscillation in a vertical direction. At what point during the oscillation will the ball-earth-spring system have the most negative gravitational potential energy?
5. In a longitudinal wave...
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6. In transverse waves...
| A. the vibrational motion of the particles is due to the expansion and contraction of the atoms that make up the particles |
| B. the vibrational motion of the particles is faster in the surface of the medium than the inside of the medium. |
| C. the vibrational motion of the particles is perpendicular to the direction of propagation of the disturbance. |
| D. the vibrational motion of the particles is constantly alternating between its electric and magnetic fields. |
| E. the vibrational motion of the particles is parallel to the direction of propagation of the disturbance. |
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A mass is moving at 10 m/s in the +x direction and it collides in a perfectly elastic collision with a mass of 4 kg moving in the -x direction. The collision takes places in 0.22 seconds and after the collision the mass that was moving in the +x direction is moving in the -x direction at 8 m/s and the mass that was moving in the -x direction is moving in the +x direction at 14 m/s. What is the magnitude of the average force, in Newtons, on the first mass which was originally moving in the +x direction before the collision?
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Design an experiment to test physical quantities that affect the period of a pendulum. Use Experiment 1: Oscillating Spring to guide your experimental procedure. You are provided the mass set and string for your experimental materials. The period should be tested against a change in amplitude (use angles less than 30 degrees), a change in mass, and a change in length, one variable at at time using a wide range of data. Use your results to verify which variable(s) effect the period of the pendulum as given in the introduction. In Experiment 1: Oscillating Spring, the spring constant was able to be determined. In a similar fashion, determine the value of g and include an error analysis in your report. Include the calculation of this constant in your data analysis. I just need help figuring out the experiment for the pendulum. |
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Standard test conditions (STC) for panels are 1000 W/m2incoming radiation, panel oriented normal to the sun, and 25 °C. If all other conditions are the same but we decrease the temperature, how will this affect power output of the panel, relative to its STC rating? Why?
How is solar energy wasted when the frequency of incoming solar radiation is too low? When the frequency is too high?
How does a multi-junction solar cell improve efficiency compared to a single-junction cell?
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Steam at 100 °C is bubbled into 2.70 kg of water at 25 °C in a calorimeter cup. How much steam will have been added when the water in the cup reaches 55 °C? (Ignore the effect of the cup.)
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What is the ideal mechanical advantage in using a (frictionless) ramp to raise a mass of 9 kg that is at an angle of theta θ = 22 degrees. Explanation needed please. Thank you..
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What is the abjective, goal, abstract, and purpose of rotational kinetic energy lab in physics
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Global warming has been linked to the growth of population of some insects and pests in cooler areas where they have not been previously seen. What global systems does this population growth affect? Identify a positive and a negative feedback resulting from it.
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1) While standing on a stationary skateboard, Sunita catches a heavy ball thrown to her by a friend in the direction that the skateboard is pointing. What is the result of her catching the ball?
A. She begins rolling at the same speed the ball had before she caught it.
B. She begins rolling at a greater speed than the ball had before she caught it.
C. She begins rolling at a lower speed than the ball had before she caught it.
D. She remains stationary after catching the ball.
2)A figure skater performing a spin starts with his arms spread wide and then brings them in close to his body. What is the result?
A. His angular velocity increases, since his moment of inertia decreased.
B. His angular velocity increases, since his moment of inertia increased.
C. His angular velocity decreases, since his moment of inertia decreased.
D. His angular velocity decreases, since his moment of inertia increased.
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