1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
katrin2010 [14]
3 years ago
12

A dock worker applies a constant horizontal force of 80.5 N to a block of ice on a smooth horizontal floor. The frictional force

is negligible.The block starts from rest and moves a distance 13.0 m in a time 4.50 s.(a)What is the mass of the block of ice?----- I found this to be 56.9kg and got it right.(b)If the worker stops pushing at the end of 4.50 s, how far does the block move in the next 4.20s ? -
Physics
1 answer:
Eddi Din [679]3 years ago
5 0

Answer:

(a). The mass of the block of ice is 62.8 kg.

(b). The distance is 24.192 m.

Explanation:

Given that,

Horizontal force = 80.5 N

Distance = 13.0 m

Time = 4.50 s

(a). We need to calculate the acceleration of the block of ice

Using equation of motion

s=ut+\dfrac{1}{2}at^2

Put the value into the formula

13=0+\dfrac{1}{2}\times a\times(4.50)^2

a=\dfrac{13\times2}{(4.50)^2}

a=1.28\ m/s^2

We need to calculate the mass of the block of ice

Using formula of force

F = ma

m=\dfrac{F}{a}

Put the value into the formula

m=\dfrac{80.5}{1.28}

m=62.8\ kg

(b). If the worker stops pushing at the end of 4.50 s,

We need to calculate the velocity

Using equation of motion

v =u+at

Put the value into the formula

v=0+1.28\times4.50

v=5.76\ m/s

We need to calculate the distance

Using formula of distance

v = \dfrac{d}{t}

d=v\times t

Put the value into the formula

d=5.76\times4.20

d=24.192\ m

Hence, (a). The mass of the block of ice is 62.8 kg.

(b). The distance is 24.192 m.

You might be interested in
Please help me find out this answer
Elanso [62]
The direction of work.........

4 0
2 years ago
What experimental evidence led to the development of this atomic model from the one before it?
Marina86 [1]

Answer:

A few of the positive particles aimed at a gold foil seemed to bounce back

Explanation:

7 0
2 years ago
Read 2 more answers
One way to measure g on another planet or moon by remote sensing is to measure how long it takes an object to fall a given dista
Jlenok [28]

Answer:

(a) 0.94 m/s²

(b) g (planet) = 0.096g

Explanation:

(a)

From Newton's equation of motion,

S = ut + 1/2gt²......................... equation 1

Making g the subject of equation 1

g =( S - ut)/t² ........................ equation 2

Where  s = distance ( m), u = initial velocity (m/s), t = time (s), g = acceleration due to gravity (m/s²)

From the question, S = 12.02 m, t = 3.58 s, u= 0 ( at rest),

Substituting these values in equation 2

g = {12.02 -(0×3.58)}/3.58²

g = (12.02)/12.82

g = 0.94 m/s²

∴ The acceleration due to gravity on the planet = 0.94 m/s²

(b) g (planet)/g (earth) = 0.94/9.80

     g (planet) = 0.096 g (earth).

The acceleration due to gravity of the planet in terms of the earth g  is

g (planet) = 0.096g

5 0
3 years ago
Identify and sketch all the external forces acting on the chair. because the chair can be represented as a point particle of mas
SOVA2 [1]

There are two external force acts on the chair.

1. The force due to earth gravity, acts in the downward direction.

2. Reaction force of the gravity, which acts in the Upward direction (Normal Force).

On every object, there is a force acts due to gravity of earth, which pulls the object towards the centre of earth, known as gravity force, always acts in the downward direction. Mathematically it's given as

F=mg

here, m is the mass of the object, and g is the acceleration of gravity.

To balance this gravity force, a counter force acts in the opposite direction, whose magnitude is equal to the force of gravity

8 0
3 years ago
Read 2 more answers
What is the animal behavior where organisms imitate another organism or environment in some way?
aksik [14]

Mimicry. This is when oraganisms imitate another oraganism whether it be physical or behavoioral.

8 0
3 years ago
Other questions:
  • What is the s. i unit of current​
    15·2 answers
  • Definition of termperature in thermodynamics
    14·1 answer
  • A ______________________ is a simple machine that consists of an inclined plane wrapped around a central cylinder.
    8·2 answers
  • Please help me with 1 and 2
    6·1 answer
  • Which explains what a velocity time graph would look like with no acceleration?
    14·2 answers
  • Which statement correctly describes protons? They have no charge and are present in the nucleus of an atom. They have a negative
    7·2 answers
  • A song is playing on a radio. Which of the following best
    15·2 answers
  • 12. Which of these is more dense?
    10·1 answer
  • Stars emit different wavelengths of visible light due to their different
    14·2 answers
  • What is the dissolved substance in a solution? A.particles B. solute C.solvement D.water​
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!