1- a worker with spikes on his shoes pulls with a constant horizontal force of magnitude 20 N on a box of mass 40 kg resting on the flat, frictionless surface of a frozen lake. What is the acceleration of the box ?
1- a worker with spikes on his shoes pulls with a constant horizontal force of magnitude 20 N on a box of mass 40 kg resting on the flat, frictionless surface of a frozen lake. What is the acceleration of the box ?
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question
![10:19
Homework -1-202...
Homework
1- a worker with spikes on his shoes pulls with a constant
horizontal force of magnitude 20 N on a box of mass 40 kg
resting on the flat, frictionless surface of a frozen lake. What
is the acceleration of the box ?
2- If we take east as x- axis and north as y- axis, then
displacement = 20 i +10'j. Find the magnitude of displacement.
3. A man walks on a straight road from his home to a market
2.5 km away with a speed of 5 km/hr. Finding the market
closed, he instantly turns and walks back home with a speed
of 7.5 km/hr. Find The average speed of the man over the
interval of time o to 40 min.
4- The motion of a particle is described by the equation x = a
+ bt where a =15cm and b = 3cm. find the velocity at time 3
sec.
5- The displacement of the particle is given by y= a + bt + ct
- dt'. Find the initial velocity and acceleration.
6- A particle is moving eastwards with velocity of 5 m/sec. In
10 sec the velocity changes to 5 m/sec northwards. What is
the average acceleration and direction?
V. = 5 m/sec
VI5 m/ sec
7- If a body having starts moving from rest with uniform
acceleration 8 m/sec'. Find the velocity and distance travelled
by it after 8 sec.
8- If a body is thrown up with the velocity of 15 m/sec. Find the
maximum height and the distance after 4 sec.
9- A bowling ball of mass 7.5 kg travelling at 10 m sec'rolls off a
horizontal table 1m high. (Assume the acceleration due to gravity is
10 m sec, and the effects of air resistance may be ignored unless
otherwise stated.)
a Calculate the ball's horizontal velocity just as it strikes the floor.
b What is the vertical velocity of the ball as it strikes the floor?
c Calculate the velocity of the ball as it reaches the floor.
d What time interval has elapsed between the ball leaving the table
and striking the floor?
e Calculate the horizontal distance travelled by the ball as it falls.
10- A softball of mass 250 gm is thrown with an initial velocity of 16 m
sec-at an angle 0 to the horizontal. The total time od flight is 12 sec.
What is the angle 0?
11- A skater moves around circle of radius 30 m. The central force of
450 N. After 40 sec, the skater finish 2 revolution. What is the mass
of the skater?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F6f51acbc-c3ff-4514-8bf2-44bae1cc5050%2F477fa535-3547-4884-a766-8d513ee4a110%2Fdefne08_processed.jpeg&w=3840&q=75)
Transcribed Image Text:10:19
Homework -1-202...
Homework
1- a worker with spikes on his shoes pulls with a constant
horizontal force of magnitude 20 N on a box of mass 40 kg
resting on the flat, frictionless surface of a frozen lake. What
is the acceleration of the box ?
2- If we take east as x- axis and north as y- axis, then
displacement = 20 i +10'j. Find the magnitude of displacement.
3. A man walks on a straight road from his home to a market
2.5 km away with a speed of 5 km/hr. Finding the market
closed, he instantly turns and walks back home with a speed
of 7.5 km/hr. Find The average speed of the man over the
interval of time o to 40 min.
4- The motion of a particle is described by the equation x = a
+ bt where a =15cm and b = 3cm. find the velocity at time 3
sec.
5- The displacement of the particle is given by y= a + bt + ct
- dt'. Find the initial velocity and acceleration.
6- A particle is moving eastwards with velocity of 5 m/sec. In
10 sec the velocity changes to 5 m/sec northwards. What is
the average acceleration and direction?
V. = 5 m/sec
VI5 m/ sec
7- If a body having starts moving from rest with uniform
acceleration 8 m/sec'. Find the velocity and distance travelled
by it after 8 sec.
8- If a body is thrown up with the velocity of 15 m/sec. Find the
maximum height and the distance after 4 sec.
9- A bowling ball of mass 7.5 kg travelling at 10 m sec'rolls off a
horizontal table 1m high. (Assume the acceleration due to gravity is
10 m sec, and the effects of air resistance may be ignored unless
otherwise stated.)
a Calculate the ball's horizontal velocity just as it strikes the floor.
b What is the vertical velocity of the ball as it strikes the floor?
c Calculate the velocity of the ball as it reaches the floor.
d What time interval has elapsed between the ball leaving the table
and striking the floor?
e Calculate the horizontal distance travelled by the ball as it falls.
10- A softball of mass 250 gm is thrown with an initial velocity of 16 m
sec-at an angle 0 to the horizontal. The total time od flight is 12 sec.
What is the angle 0?
11- A skater moves around circle of radius 30 m. The central force of
450 N. After 40 sec, the skater finish 2 revolution. What is the mass
of the skater?
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