Physics

In the Bohr model of the hydrogen atom, the speed of the electron is approximately 2.2 106 m/s.Find the central force acting on the electron as it revolves in a circular orbit of radius 4.63 x 10-11 m.Answer in units of N.
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Hi, please help! _One workman is measured as having a power of 528W. His weight is 800N. He can develop the same power climbing a ladder, whose rungs are 30cm apart. How many rungs can he climb in 5s?
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What net force is needed to increase the velocity of a 5 kg object by 3 m/s over the course of 2.5 seconds?
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I dont quite understand these could someone walk me through it when they give the answer?
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Consider a car of mass m moving with an initial speed Vo on a straight, flat road. At time t=0, the driver fully applies the breaks to avoid colliding with debris in the road in front of the car. The cars wheels lock, causing the car to slide on the roadway until the car stops, before running over the debris. The distance that the car slides is D. The coefficient of kinetic friction between the cars tires and the roadway is a constant value of Uk.A) Sketch a free body diagram for the car sliding to rest and write Fnet equationsA) does the value D increase or decrease with increasing initial speed?B) does the value D increase or decrease with increasing the coefficient of friction?C) derive an equation for the acceleration of the car in terms of Uk and physical consonants
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A weightlifter lifts a 350 N set of weights over his head a vertical distance of 2.5 meters above the floor. Calculate the work the athlete does on the weights, assuming he lifts them at a constant speed.A. 525 JB. 750 JC. 1005 JD. 700 NmE. 875 J
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A projectile is to be launched at an angle of 30 so that it falls beyond the pond of length 20 meters as shown in the figure.a) What is the range of values of the initial velocity so that the projectile falls between points M and N?
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what is the purpose of the thermal energy tranfer lab
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a)iii) as the wheelbarrow was being pushed, the tyre went over a small stone. Describe and explain how the pressure changes.
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The deceleration of the dummy is less than the deceleration of the passenger compartment.Explain why this is of benefit for the safety of a passenger.
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what was stored when you bent the ruler in your left hand?
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Explain why the temperature is not changing at X
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The mass of a water skier is 54 kg. Calculate his/her weight if the gravitational field strength is 10 N/kg.
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if clarisses mass on earth is 52kg what would be her weight on venus if the acceleration due to gravity on that planet is 8.87 m/s^2
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An object is projected with speed of 4ms at an angle of 60 to horizontal. Calculate the time of flight of the object. (g=10ms2)
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a 25 kg crate is pushed horizontally with a force of 70N. if the coefficient of friction is .20, calculate the acceleration of the crate.
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3. Which is not an example of energy(5 Points)lightthermalheatchemical
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You roll a toy car, and it moves 10 meters in five seconds. What is the car's velocity?
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1. Taking accurate measurements of small values using the measure many and average method. Each oscillation takes a small amount of time, and your reaction time is about 0.1 seconds. This means too much of the time you measure is your reaction time. Find out the percentage error with this calculation;a. ((reaction time)(time for one oscillation))x100=% error b. To reduce the percentage error, time for ten oscillations.c. Take the average time by dividing your answer by ten.d. Your reaction time is still the same, 0.1 s. Find out the new percentage error with this calculation;
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at room tmeperature none of the metals are
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2 questions, 100 pointsGravitational force between objects ____________ as objects move farther apart, and it is ___________ between objects that are closer together. increases, weaker increases, stronger decreases, weaker decreases, strongerIn science, weight is measure inPoundsKelvinNewtonsLiters
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The force of gravity can also be referred to as the force of _____________.
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the image in figure 16.36 combines observations made with visible light and radio telescopes. which color in the image represents the radio emission?
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A child on ice skates is given a small push from behind by a parent. How are forces used to describe the resulting motion?(1 point)Because of equal and opposite reactions, there will be a force opposing the push from the parent, and they will not move.Because of equal and opposite reactions, there will be a force opposing the push from the parent, and they will not move.There is an unbalanced force on the child, and the childs motion will change direction or increase speed.There is an unbalanced force on the child, and the childs motion will change direction or increase speed.There is a balanced force on the child, and the childs motion will change direction or increase speed.There is a balanced force on the child, and the childs motion will change direction or increase speed.Because of equal and opposite reactions, the child will move in the opposite direction to the force.
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