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
GuDViN [60]
2 years ago
8

A dockworker applies a constant horizontal force of 80.0 N to a block of ice on a smooth horizontal floor. The frictional force

is negligible. The block starts from rest and moves 11.0 m in 5.00 s. (a) what is the mass of the block office? (b) If the worker stops pushing at the end of 5.00 s, how far does the block move in the next 5.00 s?
Physics
1 answer:
Tamiku [17]2 years ago
4 0

Answer:

(a) 91 kg (2 s.f.)    (b) 22 m

Explanation:

Since it is stated that a constant horizontal force is applied to the block of ice, we know that the block of ice travels with a constant acceleration and but not with a constant velocity.

(a)

                                                   s \ = \ ut \ + \ \displaystyle\frac{1}{2} at^{2} \\ \\ a \ = \ \displaystyle\frac{2(s \ - \ ut)}{t^{2}} \\ \\ a \ = \ \displaystyle\frac{2(11 \ - \ 0)}{5^{2}} \\ \\ a \ = \ \displaystyle\frac{22}{25} \\ \\ a \ = \ 0.88 \ \mathrm{m \ s^{-2}}

     Subsequently,

                                                  F \ = \ ma \\ \\ m \ = \ \displaystyle\frac{F}{a} \\ \\ m \ = \ \displaystyle\frac{80 \ \mathrm{kg \ m \ s^{-2}}}{0.88 \ \mathrm{m \ s^{-2}}} \\ \\ m \ = \ 91 \mathrm{kg} \ \ \ \ \ \ (2 \ \mathrm{s.f.})

*Note that the equations used above assume constant acceleration is being applied to the system. However, in the case of non-uniform motion, these equations will no longer be valid and in turn, calculus will be used to analyze such motions.

(b) To find the final velocity of the ice block at the end of the first 5 seconds,

                                                    v \ = \ u \ + \ at \\ \\ v \ = \ 0 \ + \ (0.88 \mathrm{m \ s^{-2}})(5 \ \mathrm{s}) \\ \\ v \ = \ 4.4 \ \mathrm{m \ s^{-1}}

     According to Newton's First Law which states objects will remain at rest

     or in uniform motion (moving at constant velocity) unless acted upon by

     an external force. Hence, the block of ice by the end of the first 5

     seconds, experiences no acceleration (a = 0) but travels with a constant

     velocity of 4.4 m \ s^{-1}.

                                                    s \ = \ ut \ + \ \displaystyle\frac{1}{2}at^{2} \\ \\ s \ = \ (4.4 \ \mathrm{m \ s^{-2}})(5 \ \mathrm{s}) \ + \ \displaystyle\frac{1}{2}(0)(5^{2}) \\ \\ s \ = \ 22 \ \mathrm{m}

      Therefore, the ice block traveled 22 m in the next 5 seconds after the

      worker stops pushing it.

You might be interested in
Write a short summary paragraph that could go at the end of the text
UNO [17]

Answer:

The electro magnesium of the atoms cause the magnetic force to charge thus creating electricity. just kidding

Explanation:

If you read on the second paragraph it states that magnesium charged created electricity.

3 0
2 years ago
A coal - fired power station produces 100MJ of electrical energy when it is supplied with 400MJ of energy from its fuel. The eff
Alexus [3.1K]

Answer:

100 divide by 400 times 100 percent

8 0
2 years ago
1. What do you mean by energy ?
sammy [17]

Answer:

<em><u>1</u></em><em><u>.</u></em><em><u> </u></em><em><u>T</u></em><em><u>h</u></em><em><u>e</u></em><em><u> </u></em><em><u>a</u></em><em><u>b</u></em><em><u>i</u></em><em><u>l</u></em><em><u>i</u></em><em><u>t</u></em><em><u>y</u></em><em><u> </u></em><em><u>o</u></em><em><u>f</u></em><em><u> </u></em><em><u>a</u></em><em><u> </u></em><em><u>b</u></em><em><u>o</u></em><em><u>d</u></em><em><u>y</u></em><em><u> </u></em><em><u>t</u></em><em><u>o</u></em><em><u> </u></em><em><u>d</u></em><em><u>o</u></em><em><u> </u></em><em><u>a</u></em><em><u> </u></em><em><u>w</u></em><em><u>o</u></em><em><u>r</u></em><em><u>k</u></em><em><u> </u></em><em><u>i</u></em><em><u>s</u></em><em><u> </u></em><em><u>c</u></em><em><u>a</u></em><em><u>l</u></em><em><u>l</u></em><em><u>e</u></em><em><u>d</u></em><em><u> </u></em><em><u>e</u></em><em><u>n</u></em><em><u>e</u></em><em><u>r</u></em><em><u>g</u></em><em><u>y</u></em><em><u>.</u></em><em><u> </u></em>

<em><u>2</u></em><em><u>.</u></em><em><u> </u></em><em><u>T</u></em><em><u>h</u></em><em><u>e</u></em><em><u> </u></em><em><u>S</u></em><em><u>.</u></em><em><u>I</u></em><em><u>.</u></em><em><u> </u></em><em><u>u</u></em><em><u>n</u></em><em><u>i</u></em><em><u>t</u></em><em><u> </u></em><em><u>o</u></em><em><u>f</u></em><em><u> </u></em><em><u>e</u></em><em><u>n</u></em><em><u>e</u></em><em><u>r</u></em><em><u>g</u></em><em><u>y</u></em><em><u> </u></em><em><u>i</u></em><em><u>s</u></em><em><u> </u></em><em><u>j</u></em><em><u>o</u></em><em><u>u</u></em><em><u>l</u></em><em><u>e</u></em><em><u>(</u></em><em><u>J</u></em><em><u>)</u></em><em><u>.</u></em>

<em><u>3</u></em><em><u>.</u></em><em><u>T</u></em><em><u>h</u></em><em><u>e</u></em><em><u> </u></em><em><u>d</u></em><em><u>i</u></em><em><u>f</u></em><em><u>f</u></em><em><u>e</u></em><em><u>r</u></em><em><u>e</u></em><em><u>n</u></em><em><u>t</u></em><em><u> </u></em><em><u>t</u></em><em><u>y</u></em><em><u>p</u></em><em><u>e</u></em><em><u>s</u></em><em><u> </u></em><em><u>o</u></em><em><u>f</u></em><em><u> </u></em><em><u>e</u></em><em><u>n</u></em><em><u>e</u></em><em><u>r</u></em><em><u>g</u></em><em><u>y</u></em><em><u> </u></em><em><u>a</u></em><em><u>r</u></em><em><u>e</u></em><em><u> </u></em><em><u>:</u></em>

  • <em><u>M</u></em><em><u>e</u></em><em><u>c</u></em><em><u>h</u></em><em><u>a</u></em><em><u>n</u></em><em><u>i</u></em><em><u>c</u></em><em><u>a</u></em><em><u>l</u></em><em><u> </u></em><em><u>E</u></em><em><u>n</u></em><em><u>e</u></em><em><u>r</u></em><em><u>g</u></em><em><u>y</u></em>
  • <em><u>H</u></em><em><u>e</u></em><em><u>a</u></em><em><u>t</u></em><em><u> </u></em><em><u>E</u></em><em><u>n</u></em><em><u>e</u></em><em><u>r</u></em><em><u>g</u></em><em><u>y</u></em>
  • <em><u>L</u></em><em><u>i</u></em><em><u>g</u></em><em><u>h</u></em><em><u>t</u></em><em><u> </u></em><em><u>E</u></em><em><u>n</u></em><em><u>e</u></em><em><u>r</u></em><em><u>g</u></em><em><u>y</u></em>
  • <em><u>S</u></em><em><u>o</u></em><em><u>u</u></em><em><u>n</u></em><em><u>t</u></em><em><u> </u></em><em><u>E</u></em><em><u>n</u></em><em><u>e</u></em><em><u>r</u></em><em><u>g</u></em><em><u>y</u></em>
  • <em><u>E</u></em><em><u>l</u></em><em><u>e</u></em><em><u>c</u></em><em><u>t</u></em><em><u>r</u></em><em><u>i</u></em><em><u>c</u></em><em><u>a</u></em><em><u>l</u></em><em><u> </u></em><em><u>E</u></em><em><u>n</u></em><em><u>e</u></em><em><u>r</u></em><em><u>g</u></em><em><u>y</u></em><em><u> </u></em>
  • <em><u>M</u></em><em><u>a</u></em><em><u>g</u></em><em><u>n</u></em><em><u>e</u></em><em><u>t</u></em><em><u>i</u></em><em><u>c</u></em><em><u> </u></em><em><u>E</u></em><em><u>n</u></em><em><u>e</u></em><em><u>r</u></em><em><u>g</u></em><em><u>y</u></em><em><u> </u></em>
  • <em><u>C</u></em><em><u>h</u></em><em><u>e</u></em><em><u>m</u></em><em><u>i</u></em><em><u>c</u></em><em><u>a</u></em><em><u>l</u></em><em><u> </u></em><em><u>E</u></em><em><u>n</u></em><em><u>e</u></em><em><u>r</u></em><em><u>g</u></em><em><u>y</u></em><em><u> </u></em>
  • <em><u>N</u></em><em><u>u</u></em><em><u>c</u></em><em><u>l</u></em><em><u>e</u></em><em><u>a</u></em><em><u>r</u></em><em><u> </u></em><em><u>E</u></em><em><u>n</u></em><em><u>e</u></em><em><u>r</u></em><em><u>g</u></em><em><u>y</u></em><em><u> </u></em>

Explanation:

<h3 /><h3><em><u>H</u></em><em><u>o</u></em><em><u>p</u></em><em><u>e</u></em><em><u> </u></em><em><u>i</u></em><em><u>t</u></em><em><u> </u></em><em><u>w</u></em><em><u>o</u></em><em><u>r</u></em><em><u>k</u></em><em><u>s</u></em><em><u> </u></em><em><u>o</u></em><em><u>u</u></em><em><u>t</u></em><em><u> </u></em><em><u>!</u></em><em><u>!</u></em></h3>
5 0
3 years ago
A parallel-plate capacitor has a plate area of 0.2 m^2 and a plate separation of 0.1 mm. If the charge on each plate has a magni
barxatty [35]

Answer:

The potential difference across the plates is 226 V.

Explanation:

Given;

area of the capacitor plate, A = 0.2 m²

separation, d = 0.1 mm = 0.1 x 10⁻³ m

charge on each plate, Q = 4 x 10⁻⁶ C

Charge on the capacitor is given by;

Q = CV

Where;

C is the capacitance of the capacitor, given as;

C = ε₀A / d

Then, the potential difference across the plates is given by;

V = \frac{Q}{C} = \frac{Qd}{\epsilon_o A} = \frac{(4*10^{-6})(0.1*10^{-3})}{(8.85*10^{-12})(0.2)}\\\\V = 226 \ V

Therefore, the potential difference across the plates is 226 V.

5 0
2 years ago
If a person pulls back a rubber band on a slingshot without letting to go of it, what type of energy will the rubber band have?
Travka [436]

Answer:

Potential energy. Releasing it, the potential energy would convert into motion, kinetic energy.

Potential energy is when an object has some sort of potential eg. for motion such as in this example.

7 0
3 years ago
Other questions:
  • An object weighs 7.84 N when it is in air and 6.86 N when it is immersed in water of density 1000 kg/m3. What is the density of
    12·1 answer
  • How can a heavy moving van have the same momentum as a small motorcycle?
    8·1 answer
  • Examples of energy transfers include collisions in chemical and nuclear reactions.
    8·1 answer
  • An engineer is considering possible trajectories to use for emergency descent of a lunar module from low moon orbit to the lunar
    7·1 answer
  • 1. 20.0 mL of a liquid has a mass of 58.2 g. What is the density of the liquid?
    13·2 answers
  • A sound wave travels with a velocity of 1.5 m/s and has a frequency of 500 Hz. What is its wavelength?
    12·1 answer
  • Help
    5·1 answer
  • The gravitational field strength due to its planet is 5N/kg What does it mean?
    13·1 answer
  • What is the mass of a 50 kg person on earth?
    9·1 answer
  • Where is the deepest cave in the world? How far down is it located?
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!