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.

Trigonometry (MindTap Course List)
8th Edition
ISBN:9781305652224
Author:Charles P. McKeague, Mark D. Turner
Publisher:Charles P. McKeague, Mark D. Turner
Chapter2: Right Triangle Trigonometry
Section: Chapter Questions
Problem 28CT: Force Tyler and his cousin Kelly have attached a rope to the branch of a tree and tied a board to...
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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 +10j. 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
- dr'. 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
V1 = 5 m/ sec
Transcribed Image Text: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 +10j. 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 - dr'. 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 V1 = 5 m/ sec
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