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Physics 101 Mechanics Q&A Archive of October 31, 2021

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October 31 of 2021

In circular motion, a tangential acceleration can change the magnitude of the velocity but not its direction. Explain your answer.
A 450 kg broken golf cart is pushed across the concrete floor of a warehouse. In relation to a coordinate system set up by the worker doing the pushing the cart moves 22 m at an angle of 110° counterclockwise from the y-axis. If the worker is applying a constant force of F = (-100î - 10ĵ) N how…
Score? 4 zero velocity constant velocity
negative velocity positive velocity
negative velocity positive velocity
Score 7 positive velocity (velocity is increasing) negative velocity (velocity is decreasing)
1 constant velocity zero velocity
The graph in Figure 2-22 describes the motion of a cruise ship during its voyage through calm waters. The positive d-direction is defined to be south.0.33m/s:: average speed -0.33m/s:: average velocity0.53m/s:: average speed -0.53m/s:: average velocity
With the presence of kinetic friction, a brick pulled by gravity can no longer slide down an inclined plane at a constant acceleration.
Considering two different ways in the figure to push two identical heavy boxes to move at a constant speed, case a) is more strenuous than case b) because case a) has a higher kinetic friction force.
An engine works or 25 percent efficiency. If the engine does 600j of work every minute, how many joules per minute
Please explain why the average of pulling force F in Region (ii) can be regarded as the kinetic friction force fk
A bullet is fired up in the air at 370m/s how long will the bullet rise when it hits its peak height
Free fall problems
A marathoner run 22 km N and then 32 km S. Assuming the entire run takes 4.2 hours, solve the following: a) total displacement for the run b) average velocity c) total distance traveled d) average speed
A particle of rest energy \( 547 \mathrm{MeV} \) is moving in the \( x \) direction with a speed of \( 0.624 c \).It decays into 2 new particles, each of rest energy \( 106 \mathrm{MeV} \). One of the decay particleshas a kinetic energy of \( 301 \mathrm{MeV} \) and is moving at an angle of \(…
Light of wavelength 540 nm falls on two slits and produces an interference pattern in which the third-order bright red fringe is 30 mm from the central fringe on a screen 2.6 m away. What is the separation of the two slits?
How can I calculate forces
Explain to me determine
A 200 kg weather rocket is loaded with 100 kg of fuel and fired straight up. It accelerates upward at 30.0 m/s2 for 30.0 s, then runs out of fuel. Ignore any air resistance effects. A. What is the rocket’s maximum altitude? B. How long is the rocket in the air?
Two cables BG and BH are attached to frame ACD as shown. Knowing that the tension in cable BH is 750 N, determine the components of the force exerted by cable BH on the frame at B.
An elevator accelerates downward at 2.4 m/s 2 . What force does the elevator’s floor exert on a 52-kg passenger?
A slingshot will shoot a 10 g pebble 22.0 m straight up.(a) How much potential energy is stored in the slingshot’s rubber band?(b) With the same potential energy stored in the rubber band, how high can the slingshot shoot a 25 gpebble?(c) What physical effects did you ignore in solving this…
A force of 800 N stretches a certain spring distance of 0.200 m.(a) What is the potential energy of the spring when it is stretched 0.200 m? (b) What is the potential energy when it is compressed 5.00 cm?
A 120 kg mail bag hangs by a vertical rope 3.50 m long. A postal worker then displaces the bag to a position 2.0 m sideways from its original position, always keeping the rope taut.(a) What horizontal force is necessary to hold the bag in the new position?(b) As bag is moved to this position,…
A 500 kg sack of flour is lifted vertically at a constant speed of 3.50 m/s through the height of 15.0 m. (a) How great a force is required?(b) How much work is done on the sack by the lifting force? What becomes of this work?
In one day, a 75.0 kg mountain climber ascends from the 1500 m level on a vertical cliff to the top at 2400 m. The next day, she descends from the top to the base of the cliff, which is at an elevation of 1350 m. What is her change in gravitational potential energy,(a) on the first day; and(b)…
A 450 kg broken golf cart is pushed across the concrete floor of a warehouse. In relation to a coordinate system set up by the worker doing the pushing the cart moves 22 m at an angle of 110° counterclockwise from the y-axis. If the worker is applying a constant force of F = (-100î - 10ĵ) N how…
Score? 4 zero velocity constant velocity
negative velocity positive velocity
negative velocity positive velocity
Score 7 positive velocity (velocity is increasing) negative velocity (velocity is decreasing)
1 constant velocity zero velocity
The graph in Figure 2-22 describes the motion of a cruise ship during its voyage through calm waters. The positive d-direction is defined to be south.0.33m/s:: average speed -0.33m/s:: average velocity0.53m/s:: average speed -0.53m/s:: average velocity
With the presence of kinetic friction, a brick pulled by gravity can no longer slide down an inclined plane at a constant acceleration.
Considering two different ways in the figure to push two identical heavy boxes to move at a constant speed, case a) is more strenuous than case b) because case a) has a higher kinetic friction force.
An engine works or 25 percent efficiency. If the engine does 600j of work every minute, how many joules per minute
Please explain why the average of pulling force F in Region (ii) can be regarded as the kinetic friction force fk
A bullet is fired up in the air at 370m/s how long will the bullet rise when it hits its peak height
Free fall problems
A particle of rest energy \( 547 \mathrm{MeV} \) is moving in the \( x \) direction with a speed of \( 0.624 c \).It decays into 2 new particles, each of rest energy \( 106 \mathrm{MeV} \). One of the decay particleshas a kinetic energy of \( 301 \mathrm{MeV} \) and is moving at an angle of \(…
Light of wavelength 540 nm falls on two slits and produces an interference pattern in which the third-order bright red fringe is 30 mm from the central fringe on a screen 2.6 m away. What is the separation of the two slits?
How can I calculate forces
Explain to me determine
A 200 kg weather rocket is loaded with 100 kg of fuel and fired straight up. It accelerates upward at 30.0 m/s2 for 30.0 s, then runs out of fuel. Ignore any air resistance effects. A. What is the rocket’s maximum altitude? B. How long is the rocket in the air?
Two cables BG and BH are attached to frame ACD as shown. Knowing that the tension in cable BH is 750 N, determine the components of the force exerted by cable BH on the frame at B.
A slingshot will shoot a 10 g pebble 22.0 m straight up.(a) How much potential energy is stored in the slingshot’s rubber band?(b) With the same potential energy stored in the rubber band, how high can the slingshot shoot a 25 gpebble?(c) What physical effects did you ignore in solving this…
In one day, a 75.0 kg mountain climber ascends from the 1500 m level on a vertical cliff to the top at 2400 m. The next day, she descends from the top to the base of the cliff, which is at an elevation of 1350 m. What is her change in gravitational potential energy,(a) on the first day; and(b)…