Edited Invalid date
Chapter 10: Answers Explained
The net force is zero since the mass is stationary.
The upward tension of the rope must be enough to cancel out gravity.
The horizontal component of tension T 2 must be bigger than the vertical component.
The horizontal component of tension must be less than.
The horizontal component of T 2 must be canceled by the horizontal rope T.
The coefficient of static friction must be greater than the value since a greater force is needed.
There are only two forces in the free-body diagram.
The second law gives us a number.
The first law says that inertia maintains its current motion once in motion.
The vertical force of gravity is the only force on the ball after the throw.
The ball's sideways velocity is maintained due to its inertia, because this causes the ball to accelerate in the vertical direction.
The force pair of interaction between two objects is always equal according to the third law of action-reaction.
The third law does not involve the acceleration of either object.
The net force on a single object causes the acceleration.
The net force is horizontal.
The value is negative because it is to the left.
The vertical forces have canceled out.
An object in free fall will accelerate at a constant rate.
Since the rock is already moving downward, there is an increase in speed of 9.8 m/s.
The rock will fall much farther than 4.9 m as it is already moving close to 30 m/s downward by the start of the 3rd second.
In the 4th second, it will fall an additional 35 meters.
The rock does fall in the first second of the drop, but it falls more and more over time.
The assumptions of the equations of motion are constant.
Any permutation of signs or values will work in the equations of motion.
One must use graphical methods if the acceleration is not constant.
Projectile motion involves a constant vertical acceleration and no horizontal acceleration.
Ax and ay are the same throughout the flight.
There is no change in Vx since ax is zero.
Vx is always the same.
Vy is always changing.
The projectile lands in the opposite direction so that Vyf is equal to Vyi.
The motion of the objects has a correlation to their motion.
If the inward force is released, the object will follow the law.
After the object is released, gravity will cause it to fall, but the initial motion is horizontal.
You can get this result by looking at the equation for orbital speed fromNewton.
The square root of 2 shows that the Moon must decrease in speed.
Regardless of location, mass is a property of the object.
The object's mass and planetary gravity affect the weight of the object.
The force is assumed to be equal to the weight of the object for most lifting operations.
In order to get the suitcase moving faster, this brief force must be different in the second case.
If the details of the forces contributing to the work are not easy to understand, you may want to think about the suitcase.
The power must be supplied twice if the work is done in half the time.
The mass's energy went up by 20 J.
Since it was stationary, it had no KE.
The collision is elastic and no energy is lost.
The negative sign indicates that the impulse delivered to the ball is in the opposite direction.
The ball and the wall receive the same impulses from the third law.
Through the collision, total momentum must be maintained.
The magnitude of the system's initial momentum is what we need to find.
Each player is running in a straight line.
Their individual momentums are different.
The magnitude is found using the Pythagorean theorem.
The lever arm has Force C applied to it.
The force C has an angle of 180 degrees.
Force A has a longer lever arm than force B.
The Torque supplied by A is less than the Torque supplied by B.
R 2 is the moment of inertia for a sphere.
The moment of inertia has decreased because the shape of the cloud is not changing.
The entire circuit needs to be shared between the two resistors.
The split will be 50% since the two resistors are the same.
The new resistor does not affect the original path because it forms its own parallel path.
The same current will be drawn from the original Resistor since it has the same resistance and voltage.
The current needs to be twice the current with the second resistor in place.
electrons can move around the circuit if a switch is closed.
The components within the circuit have electrons that start to flow.
The movement of electrons within the bulb causes it to light up.
The drift velocities of electrons in simple circuits are only about 0.03 cm/s.
They emerge as if they had never met.
The leading peak of the wave on the right will interfere with the leading trough of the wave on the left.
The other half of the waves are unaffected by this partial destruction.
When the waves are completely superposed, the trough will be on the peak of the waves.
Wave speed is determined by the air.
Waves won't be observed to be different by either observer.
The wavelength needs to be higher in order to give the same speed.
The higher frequencies are known as the Doppler shift.
There is a difference in the velocities.
There is an elastic collision between two objects.
Net momentum is maintained by all collisions.
The collision conserves energy.
Equal but opposite exchanges of momentums are involved in all collisions.
Inelastic collisions show that the energy is not conserved.
This is a statics problem.
Since the wedge is not moving, we are free to choose any axis of rotation we want.
To eliminate one variable, we should place the axis of rotation at either contact point.
This equation can be combined with the one above.
The object has mass spread out over many different r values, so I cannot be used.
At the lowest point of the downward swing, the angle between the lever arm and force goes from 90deg to 0deg.
The Torque will decrease since it is proportional to the sin.
This is a projectile motion problem.
55 percent of the initial energy is in potential energy.
The time to fall is determined.
To get time in flight, double this value.
Review flashcards and saved quizzes
Getting your flashcards
Privacy & Terms