Physics

during a process, if the state of the system does not change, the system energy will: multiple choice question. increase. stay the same. decrease.
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find the equivalent capacitance of a 4.20-mf capacitor and an 8.50-mf capacitor when they are connected (a) in series and (b) in parallel
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stars that lie in different places on the main sequence of the h-r diagram differ from each other mainly by having different:
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what is the speed of a spacecraft moving in a circular orbit just above the lunar surface? express your answer using two significant figures.
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an audio speaker producing a steady sound at an outdoor concert is 18 ft away from you. if you move to a position where the speaker is 78 ft distant, by what factor will the amplitude of the sound change?
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a cable with 19.01 n of tension pulls straight up on a 1.79 kg block that is initially at rest. what is the block's speed after being lifted 1.62 m?
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why do some believe in the concept of evelotion
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How did Newton discovered gravity?
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A stone is dropped in a mine shaft 15 m deep. The speed of sound is 343 m/s. How long does it take to hear the echo?
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Choose a correct short description of a real object for which this would be the correct free-body diagram (Figure 1) Check all that apply. a. An object hanging from a rope is moving up with a constant speed. b. An object hanging from a rope is moving down with a constant speed c. An object hanging from a rope is moving down with a constant acceleration d. An object hanging from a rope is moving up with a constant acceleration
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if three bulbs 30 w, 40 w, and 110 w are connected in parallel to each other and to a 120-v source, calculate the current through each bulb.
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when the ball is at its lowest point, is the tension in the string greater than, less than, or equal to the ball's weight? when the ball is at its lowest point, is the tension in the string greater than, less than, or equal to the ball's weight? the tension in the string is less than the ball's weight. the tension in the string is greater than the ball's weight. the tension in the string is equal to the ball's weight. it is impossible to determine.
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A 65 kg-mass person stands at the end of a diving board, 1.5 m from the board's pivot point. Determine the torque the person is exerting on the board with respect to the pivot point. Show your work.
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To determine the location of her center of mass, a physics student lies on a lightweight plank supported by two scales 2.50m apart, as indicated in the figure . If the left scale reads 290 N, and the right scale reads 112 N. What is the student's mass and find the distance from the student's head to her center of mass.
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Mary walked north from her home to Sheila's home, which is 4.0 kilometers away. Then she turned right and walked another 3.0 kilometers to the supermarket, which is 5.0 kilometers from her own home. She walked the total distance in 1.5 hours. What were her average speed and average velocity? A. Her average speed was about 4.6 km/hr, and her average velocity was about 3.3 km/hr. B. Her average speed was about 3.3 km/hr, and her average velocity was about 4.6 km/hr. C. Her average speed was about 3.3 km/hr, and her average velocity was 0 km/hr. D. Her average speed was 0 km/hr, and her average velocity was about 4.6 km/hr.
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1. A 8.2 kg mass hanging from a spring scale is slowly lowered onto a vertical spring.A) What does the spring scale read just before the mass touches the lower spring?B) The scale reads 14 N when the lower spring has been compressed by 2.4 cm . What is the value of the spring constant for the lower spring?C) At what compression length will the scale read zero?
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bioelectrical impedance analysis is a commercially available method used to estimate body fat percentage. the device applies a small potential between two parts of the patient's body and measures the current that flows through. with an estimate of the resistance individually of the muscle and fat between the two points, the composition of the tissue can be estimated. assume that the muscle and fat tissue can be modeled as resistors in parallel. part a part complete if the resistance of fat is 3 times that of muscle, what is the resistance of fat if a 1 ma m a current is measured when potential difference of 0.5 v v is applied to the patient's arm?
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a child rocks back and forth on a porch swing with an amplitude of 0.204 m and a period of 2.80 s.assuming the motion is approximately simple harmonic, find the child's maximum speed.
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. Lin cooked a pot of soup, then put half the soup in the freezer for a while. Now the soup in the pot is hot, and the soup in the freezer is cold. What is the difference between the molecules of the soup in the pot and the molecules of the soup in the freezer
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TRUE or FALSE Energy can be transferred from Kinetic Energy (KE) to Potential Energy (PE) and vice versa.
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How much heat will be released when 6.44 g of sulfur reacts with excess O2 according to the following equation? 2 S + 3O2 2SO3 H = -791.4 kJ
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A typical neutron star may have a mass equal to that of the sun but a radius of only 10.0 km.a. What is the gravitational acceleration at the surface of such a star?b. How fast would an object be moving if it fell from rest through a distance of 1.20 m on such a star?
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There are two objects (A and B) each with its own mass and charge. The electrostatic force between them has a value of 23.2N and is attractive. The two objects are separated by a distance of 2.3cm with object A being to the left of B. Assume one charge has 4 times the charge of the other.a. Do the two charges have the same signs or opposite signs?b. IF the two charges have opposite signs, is charge A or B negative?c. Which charge (A or B) has the higher value?d. Find the value of each charge.
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The absolute brightness of a star depends on its _____.a. size and temperatureb. distance an temperaturec. color and temperatured. distance and color
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