A boy of mass 25.0 kg skateboards down a quarter pipe of radius 3.00 m. He...
A boy of mass 25.0 kg skateboards down a quarter pipe of radius 3.00 m. He starts from rest and there is no friction. a)Find his speed at the bottom b)Find the normal force at the bottom Example 7.5: if the speed at the bottom is instead 6.00 m/s, what was the work done by friction?
Homework Answers
a)
using energy conservation
0.5 m v^2 = m g h
0.5 v^2 = 9.8* 3
v = 7.668 m/s
======
b)
W = change in kE
W = 0.5* 25 * ( 6^2 - 7.668^2)
W = - 285 J
Add Answer to:
A boy of mass 25.0 kg skateboards down a quarter pipe of radius
3.00 m. He...
s odott gi Page 204 Practice Problem 7.10: 53 - O-TOUS Find the skateboard's speed at...
s odott gi Page 204 Practice Problem 7.10: 53 - O-TOUS Find the skateboard's speed at the bottom of the pipe if he is given a push at the top edge, so that he has an initial downward speed of 2.00 m/s. Answer: 7.93 m/s. EXAMPLE 7.10 Calculating speed along a vertical circle Here we will tackle a circular-motion problem using conservation of energy. Because the acceleration in this problem is not constant, we cannot approach it with the tools...
A block of mass m = 3.00 kg starts from the rest and slides down a...
A block of mass m = 3.00 kg starts from the rest and slides down a 30.0∘ incline which is 3.60 m high. At the bottom, it strikes a block of mass M = 6.40 kg which is at rest on a horizontal surface (Figure 1). (Assume a smooth transition at the bottom of the incline.) The collision is elastic, and friction can be ignored. (A) Determine the speed of the block with mass m = 3.00 kg after the...
1) (Boy sledding on hill) A boy on a sled (total mass of boy-plus-sled m =...
1) (Boy sledding on hill) A boy on a sled (total mass of boy-plus-sled m = 34 kg) slides down a straight, snowy incline of length 4-236 m angled at a-15° with the horizontal. At the base of the hill is a tiny dip, after which the boy begins sliding up another straight hill, traveling a lern gth L2-40 m at an angle of θ2-300 with the horizontal. The boy starts from rest and ends at rest. Only gravity and...
Jim rides his skateboard (starting at rest) down a ramp that is in the shape of...
Jim rides his skateboard (starting at rest) down a ramp that is in the shape of a quarter circle with radius of 3.9 m. At the bottom of the ramp, Jim is moving at 7.5 m/s. Jim and his skateboard have a mass of 66.9 kg. How much work is done by friction as the skateboard goes down the ramp?
QUESTION 10 Tony Hawk is skating through a half-pipe with a radius of 4 m. Initially...
QUESTION 10 Tony Hawk is skating through a half-pipe with a radius of 4 m. Initially he is in a crouched position with his center of mass 0.5 m above the surface of the half-pipe. He starts from rest with his center of mass a height of 3 m above the base of the half-pipe and experiences no loss of energy from friction as he moves. At the bottom of the half-pipe he stands up and lifts his arms into...
A 5.00-kg package slides 2.60 m down a long ramp that is inclined at 25.0 ∘...
A 5.00-kg package slides 2.60 m down a long ramp that is inclined at 25.0 ∘ below the horizontal. The coefficient of kinetic friction between the package and the ramp is μk = 0.370. A)Calculate the work done on the package by friction. B)Calculate the work done on the package by gravity. C)Calculate the work done on the package by the normal force. D)Calculate the total work done on the package. E)If the package has a speed of 2.60 m/s...
A block of mass m = 3.00 kg slides down a 30.0∘ incline which is 3.60 m high. At the bottom, it s...
A block of mass m = 3.00 kg slides down a 30.0∘ incline which is 3.60 m high. At the bottom, it strikes a block of mass M = 7.50 kg which is at rest on a horizontal surface (Figure 1). (Assume a smooth transition at the bottom of the incline). The collision is elastic, and friction can be ignored. A) Determine the speed of the block with mass m = 3.00 kg after the collision. B) Determine the speed...
Problem 7.79 14 of Con A block of mass m = 3.00 kg starts from the...
Problem 7.79 14 of Con A block of mass m = 3.00 kg starts from the rest and slides down a 30.0° incline which is 3.60 m high. At the bottom, it strikes a block of mass M = 8.00 kg which is at rest on a horizontal surface (Figure 1). (Assume a smooth transition at the bottom of the incline.) The collision is elastic, and friction can be ignored. Part A Determine the speed of the block with mass...
1. A 3.00 kg mass is initially at rest when it is subjected to an applied...
1. A 3.00 kg mass is initially at rest when it is subjected to an applied force directed in the +x direction and the force of kinetic friction while upon a horizontal surface. The work done by the applied force on the mass is known to be 25.0 J over a particular time interval. a) If the speed of the mass is measured to be 3.50 m/s at the end of the time interval, what is the net work done?...
A block of mass M = 4.000 kg is released from rest at the top of...
A block of mass M = 4.000 kg is released from rest at the top of an incline of angle θ = 24.0º w.r.t. the horizontal. The coefficient of kinetic friction between the block and the incline is µk = 0.200 and the length of the incline (hypothenuse of the triangle shown below) is L = 6.00 m. ( w.r.t. = with respect to) I am trying to find: a. The work done by the normal force for the complete...
s odott gi Page 204 Practice Problem 7.10: 53 - O-TOUS Find the skateboard's speed at the bottom of the pipe if he is given a push at the top edge, so that he has an initial downward speed of 2.00 m/s. Answer: 7.93 m/s. EXAMPLE 7.10 Calculating speed along a vertical circle Here we will tackle a circular-motion problem using conservation of energy. Because the acceleration in this problem is not constant, we cannot approach it with the tools...
1) (Boy sledding on hill) A boy on a sled (total mass of boy-plus-sled m = 34 kg) slides down a straight, snowy incline of length 4-236 m angled at a-15° with the horizontal. At the base of the hill is a tiny dip, after which the boy begins sliding up another straight hill, traveling a lern gth L2-40 m at an angle of θ2-300 with the horizontal. The boy starts from rest and ends at rest. Only gravity and...
Problem 7.79 14 of Con A block of mass m = 3.00 kg starts from the rest and slides down a 30.0° incline which is 3.60 m high. At the bottom, it strikes a block of mass M = 8.00 kg which is at rest on a horizontal surface (Figure 1). (Assume a smooth transition at the bottom of the incline.) The collision is elastic, and friction can be ignored. Part A Determine the speed of the block with mass...
1. A 3.00 kg mass is initially at rest when it is subjected to an applied force directed in the +x direction and the force of kinetic friction while upon a horizontal surface. The work done by the applied force on the mass is known to be 25.0 J over a particular time interval. a) If the speed of the mass is measured to be 3.50 m/s at the end of the time interval, what is the net work done?...
Most questions answered within 3 hours.
-
Can a standard glycine and protein solutions look identical
after a ninhydrin test is complete?
Can...
asked 45 minutes ago -
What is the difference between a firm’s shutdown point in the
short run and in the...
asked 1 hour ago -
A solution containing 10.00 mL of 0.0500 M metal ion buffered to
pH = 10.00 was...
asked 1 hour ago -
Gene Regulation
Describe the regulation of the lac operon in E. coli.
a. the structure of...
asked 1 hour ago -
22. The resistivity of most metals increases with increasing
temperature, whereas the resistivity of an intrinsic...
asked 2 hours ago -
1. (a) When a battery is connected to the plates of a 6.00-µF
capacitor, it stores...
asked 5 hours ago -
A gas reservoir has the following characteristics:
A= 3,000 acres
h= 30 ft
? = 0.15...
asked 6 hours ago -
2. A television network executive has a list of 7 sitcoms and 5
reality shows to...
asked 6 hours ago -
LawVIEW Question:
As you saw in your second-order system experiments, your systems
oscillate to a change...
asked 7 hours ago -
consider the titration of 50mL of 1.5 M HCOOH with .50 M NaOH.
Ka= 1.8x10^-4 &...
asked 8 hours ago -
"provide products and mechanisms for (z)-3,4-dimethyl-2-pentene
reaction with Br2 in H2o including stereochemisty"
asked 10 hours ago -
FOR the regular expression r= (a+b)*abb
(1) Find the NFA without ε-moves for r.
(2) Convert...
asked 10 hours ago