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
BabaBlast [244]
3 years ago
7

A pendulum Bob released from some initial height such that the speed of the bob at the bottom of the swing is 1.9m/s. What is th

e initial height of the bob?
Physics
1 answer:
Dmitriy789 [7]3 years ago
8 0

Answer:

h = 18.4 cm

Explanation:

Given that,

The speed of the bob at the bottom of the swing is 1.9m/s.

We need to find the initial height of the bob. Let it is h.

We can find it using the conservation of energy i.e.

mgh=\dfrac{1}{2}mv^2

Where

v is speed of the bob

So,

h=\dfrac{v^2}{2g}\\\\h=\dfrac{(1.9)^2}{2\times 9.8}\\\\h= 0.184\ m

or

h = 18.4 cm

So, the initial height of the bob is 18.4 cm.

You might be interested in
The rate of change of velocity or speed is known as acceleration. If a car increases it speed form 10 to 20m/s in 2 seconds, the
lisov135 [29]

Answer:

A) 5 m/s/s

Explanation:

<u>Given the following data;</u>

Initial velocity = 10m/s²

Final velocity = 20m/s²

Time, t = 2 seconds.

In physics, acceleration can be defined as the rate of change of the velocity of an object with respect to time.

This simply means that, acceleration is given by the subtraction of initial velocity from the final velocity all over time.

Hence, if we subtract the initial velocity from the final velocity and divide that by the time, we can calculate an object’s acceleration.

Mathematically, acceleration is given by the equation;

Acceleration, a = \frac{final \; velocity  -  initial \; velocity}{time}

Substituting into the equation, we have;

Acceleration, a = \frac{20 - 10}{2}

Acceleration, a = \frac{10}{2}

<em>Acceleration, a = 5m/s²</em>

7 0
3 years ago
Tom has built a large slingshot, but it is not working quite right. He thinks he can model the slingshot like an ideal spring wi
Amiraneli [1.4K]

Answer:

8.9

Explanation:

We can start by calculating the initial elastic potential energy of the spring. This is given by:

U=\frac{1}{2}kx^2 (1)

where

k = 35.0 N/m is the initial spring constant

x = 0.375 m is the compression of the spring

Solving the equation,

U=\frac{1}{2}(35.0)(0.375)^2=2.5 J

Later, the professor told the student that he needs an elastic potential energy of

U' = 22.0 J

to achieve his goal. Assuming that the compression of the spring will remain the same, this means that we can calculate the new spring constant that is needed to achieve this energy, by solving eq.(1) for k:

k'=\frac{2U'}{x^2}=\frac{2(22.0)}{0.375^2}=313 N/m

Therefore, Tom needs to increase the spring constant by a factor:

\frac{k'}{k}=\frac{313}{35}=8.9

7 0
4 years ago
It is determined that a certain light wave has a wavelength of 3.012 x 10-12 m. The light travels at 2.99 x 108 m/s. What is the
gayaneshka [121]

Answer:

id.k

Explanation:

3 0
3 years ago
Divers change their body position in midair while rotating about their center of mass. In one dive, the diver leaves the board w
OlgaM077 [116]

Answer:

Her angular velocity when tucked is greater than when straight by a factor of 0.23

Explanation:

Moment of inertia (I) = mr^2 = mv^2/w^2

m is mass of the diver

v is diver's linear velocity

w is her angular velocity

When straight, I = 14 kg.m^2

mv^2/w^2 = 14

w^2 = mv^2/14

w = sqrt(mv^2/14) = 0.27sqrt(mv^2)

When tucked, I = 4 kg.m^2

w^2 = mv^2/4

w = sqrt(mv^2/4) = 0.5sqrt(mv^2)

Her angular velocity when tucked is greater than when straight by 0.23 (0.5 - 0.27 = 0.23)

5 0
4 years ago
Read 2 more answers
A scientist fills a container with sea water. The container has dimensions 30 cm x 30 cm x 40 cm The density of sea water is 102
Gnoma [55]

Answer:

30600kg

Explanation:

density=m/v make v subject of the formula

3 0
3 years ago
Other questions:
  • At very high pressures gases become?
    14·1 answer
  • What role does Nitrogen play for all living organisms?​
    8·1 answer
  • If the distance from a converging lens to the object is less than the focal length of the lens, the image will be
    5·2 answers
  • For a copper-silver alloy of composition 51 wt% Ag-49 wt% Cu and at 775˚C (1425˚F) (see Animated Figure 9.7) do the following: (
    12·1 answer
  • Determine the change in velocity of a car that starts at rest and has a final velocity of 20 m/s north
    11·1 answer
  • when the total amount of a quantity is the same before and after some event occurs, we say that the quantity is (blank)
    13·1 answer
  • Determine the Universal Gravitational Constant (G).
    12·1 answer
  • Question 1 (13 marks) A charge Q is located on the top-left corner of a square. Charges of 2Q, 3Q and 4Q are located on the othe
    12·1 answer
  • A personal narrative is a true story that cannot include any imaginary or creative writing techniques
    6·1 answer
  • The photo shows a skateboarder pushing her foot against the ground as she rides down a hill.
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!