Learn more about our help with Assignments: MechanicsRelativity
Search & Filtering
Mechanics | Relativity
A 21 kg chair initially at rest on a horizontal
floor requires a 166 N horizontal force to set
it in motion. Once the chair is in motion, a
133 N horizontal force keeps it moving at a
constant velocity.
The acceleration of gravity is 9.81 m/s
2
.
a) What is the coefficient of static friction
between the chair and the floor?
floor requires a 166 N horizontal force to set
it in motion. Once the chair is in motion, a
133 N horizontal force keeps it moving at a
constant velocity.
The acceleration of gravity is 9.81 m/s
2
.
a) What is the coefficient of static friction
between the chair and the floor?
Mechanics | Relativity
A 21 kg chair initially at rest on a horizontal
floor requires a 172 N horizontal force to set
it in motion. Once the chair is in motion, a
140 N horizontal force keeps it moving at a
constant velocity.
The acceleration of gravity is 9.81 m/s
2
.
a) What is the coefficient of static friction
between the chair and the floor?
floor requires a 172 N horizontal force to set
it in motion. Once the chair is in motion, a
140 N horizontal force keeps it moving at a
constant velocity.
The acceleration of gravity is 9.81 m/s
2
.
a) What is the coefficient of static friction
between the chair and the floor?
Mechanics | Relativity
How about some practice working with hyperbolic trig function ? Recall that
SinhQ= e^Q- e^Q / 2
CoshQ= e^Q+e^/2
TanhQ sinhQ/CoshQ
a) verify that cosh^2- sinh^2= 1
B) tanhQ1+tanhQ/1+tanhQ2= tanh(Q1+Q2)
So that the law of composition of velocities from last wrrk just mrans that boost parameters add.
SinhQ= e^Q- e^Q / 2
CoshQ= e^Q+e^/2
TanhQ sinhQ/CoshQ
a) verify that cosh^2- sinh^2= 1
B) tanhQ1+tanhQ/1+tanhQ2= tanh(Q1+Q2)
So that the law of composition of velocities from last wrrk just mrans that boost parameters add.
Mechanics | Relativity
Two blocks are resting on the floor. Block A is 3.2 kg. Block B is 4.7 kg. Both blocks need to be lifted up onto a benchtop surface that is 75 cm above the floor. How much more work will it take to lift Block B on to the benchtop than to lift Block A?
Mechanics | Relativity
An amusement park ride consists of a rotating
circular platform 9.15 m in diameter from
which 10 kg seats are suspended at the end
of 3.45 m massless chains. When the system
rotates, the chains make an angle of 42.6◦ with
the vertical.
The acceleration of gravity is 9.8 m/s2.
What is the speed of each seat?
Answer in units of m/s.
circular platform 9.15 m in diameter from
which 10 kg seats are suspended at the end
of 3.45 m massless chains. When the system
rotates, the chains make an angle of 42.6◦ with
the vertical.
The acceleration of gravity is 9.8 m/s2.
What is the speed of each seat?
Answer in units of m/s.
Mechanics | Relativity
The tape in a videotape cassette has a total
length 281 m and can play for 2 h. As the tape
starts to play, the full reel has an outer radius
of 45 mm and an inner radius of 12 mm. At
some point during the play, both reels will
have the same angular speed.
What is this common angular speed?
Answer in units of rad/s.
length 281 m and can play for 2 h. As the tape
starts to play, the full reel has an outer radius
of 45 mm and an inner radius of 12 mm. At
some point during the play, both reels will
have the same angular speed.
What is this common angular speed?
Answer in units of rad/s.
Mechanics | Relativity
What's the difference between g and G
Mechanics | Relativity
The commercial lead acid battery has 15 plates the number of negative plates will be
1)9
2)8
3)7
4)10
1)9
2)8
3)7
4)10
Mechanics | Relativity
A projectile launch speed is five times its speed at the maximum height,find the launch angle teta?
Mechanics | Relativity
a motor car is going due north at a speed of 50km per hour. it makes a
900 left turn without changing the speed. the change in the velocity of the car is about
