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
earnstyle [38]
3 years ago
13

The graph of an object's position over time is a horizontal line and y is not equal to 0. What must be true abou

Physics
1 answer:
frozen [14]3 years ago
7 0

Answer:D: the velocity is zero

Explanation:

You might be interested in
A thin rod of length 0.75 m and mass 0.42 kg is suspended freely from one end. It is pulled to one side and then allowed to swin
Goshia [24]

Answer:

(A) 0.63 J  

(B) 0.15 m

Explanation:

length (L) = 0.75 m

mass (m) =0.42 kg

angular speed (ω) = 4 rad/s

To solve the questions (a) and (b) we first need to calculate the rotational inertia of the rod (I)

I = Ic + mh^{2}  

Ic is the rotational inertia of the rod about an axis passing trough its centre of mass and parallel to the rotational axis

h is the horizontal distance between the center of mass and the rotational axis of the rod

I = (\frac{1}{12})(mL^{2} ) + m([tex]\frac{L}{2})^{2}[/tex]

I = (\frac{1}{12})(0.42 x 0.75^{2} ) + ( 0.42 x ([tex]\frac{0.75}{2})^{2}[/tex])

I = 0.07875 kg.m^{2}

(A) rods kinetic energy = 0.5Iω^{2}

  = 0.5 x 0.07875 x 4^{2} = 0.63 J   0.15 m

(B) from the conservation of energy

   initial kinetic energy + initial potential energy = final kinetic energy + final potential energy

   Ki + Ui = Kf + Uf

   at the maximum height velocity = 0 therefore final kinetic energy = 0

   Ki + Ui = Uf

   Ki = Uf - Ui

 Ki =  mg(H-h)

where (H-h) = rise in the center of mass

     0.63 = 0.42 x 9.8 x (H-h)

   (H-h) = 0.15 m

6 0
3 years ago
A book falls off a shelf that is 10.0 m tall. What is the velocity at which the book hits the ground?
Elena L [17]

Answer:

14 m/s

Explanation:

The motion of the book is a free fall motion, so it is an uniformly accelerated motion with constant acceleration g=9.8 m/s^2 towards the ground. Therefore we can find the final velocity by using the equation:

v^2 = u^2 + 2gd

where

u = 0 is the initial speed

g = 9.8 m/s^2 is the acceleration

d = 10.0 m is the distance covered by the book

Substituting data, we find

v=\sqrt{0^2 + 2(9.8 m/s^2)(10.0 m)}=14 m/s

8 0
3 years ago
According to the law of refraction, light passing from air into a piece of glass at an angle of 30 degrees will cause the light
pantera1 [17]

Answer:

bend toward the normal line

Explanation:

When light passes from a less dense to a more dense substance, (for example passing from air into water), the light is refracted (or bent) towards the normal.   In your question the light is moving from rarer to denser medium

4 0
3 years ago
The property that compares the mass of an object with its volume is _____.
Licemer1 [7]
The property that compares the mass of an object with its volume is density.
7 0
3 years ago
Read 2 more answers
The majority of the elements on the periodic table are _______. A. gases B. nonmetals C. metals D. liquids
Paladinen [302]

Option (C) is correct that the majority of the elements on the periodic table are metals.

#$# THANK YOU #$#

7 0
3 years ago
Other questions:
  • 1 point
    15·1 answer
  • How far away from the sun would a planet mercury's size have to be before it would have an atmosphere?
    13·1 answer
  • What is floatation?​
    15·2 answers
  • Magma from a volcano is considered a fluid because it can flow and it exhibits viscosity true or false
    15·1 answer
  • From left to right across a period in the periodic table, elements become less and more in their properties
    13·1 answer
  • Hi please help me in this question
    11·1 answer
  • I need help on this.
    7·1 answer
  • A peach has a layer of skin, a thick section of fruit, and a pit in the center. Which of these would a peach be a good model for
    8·2 answers
  • : A small block with mass 0.130 kg is attached to a string passing through a hole in a frictionless, horizontal surface. The blo
    7·1 answer
  • What are some examples from regular life that support the claim that gravitational interactions are are attractive and depend on
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!