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
kiruha [24]
3 years ago
7

Mrs. Smith does her daily chores. She walks 5 m to the laundry room and then turns around and walks -14 m to the kitchen. The wh

ole process takes her 11 minutes. What was her average velocity for these events?
1.48 m/s
0.212 m/s
-0.136 m/s
-0.0075 m/s

A spy is running across the bridge of an aircraft carrier. The spy is moving with a velocity of - 4 m/s relative to the carrier. However, the aircraft carrier is moving with a velocity of 12 m/s. There is a person standing stationary on a beach watching the event. What will be the velocity of the spy according to the person on the beach?
8 m/s
6 m/s
-4 m/s
-7 m/s
Physics
1 answer:
Nesterboy [21]3 years ago
8 0

Answer:

Explanation:

Velocity vs speed and distance vs displacement is a pretty important.  Distance and speed have no direction while displacement and velocity have a direction.

In other words, taking the first example, going 5m one way and then 14 the other would make the total distance 19m, while displacement would be -9m from where you started.  

Anyway, velocity is displacement divided by time.  For the first one I already got that the displacement is -9m, and the time is 11 minutes.  It's worth noting that the answers are all in m/s, so we should convert the minutes to seconds.  To do that multiply 11 minutes by (60 seconds/1 minute) so the minutes cancel out.  so 11*60 is 660 seconds.  Now, to find velocity we just divide.  -9m/660s = -.0136 Which... doesn't seem to be one of the options...

For the second part it gives two point of views.  If you were standing on the carrier, the spy would look like it was moving  4 m/s away from you, but the carrier itself is moving 12 m/s in the positive direction to an onlooker.  If it's hard to figure out try thinking what it would look like if the spy was just standing still.  it would look like they were moving -12 m/s if you were standing on the carrier.  Then if the spy was moving at say 1 m/s it would look like they were moving -11 m/s if you were standing on the carrier.  

Just keep that line of reasoning , where if it looks like the spy is moving -4 m/s from the carrier then the spy is moving 4 m/s slower than the carrier, so the spy is moving at 8 m/s

Pretty sure I got the first part right, so maybe a misprint from the question?

You might be interested in
A rocket travels at a speed of 14,000 m/s. What is the distance travelled by the rocket in 150s?
kati45 [8]

1) The distance travelled by the rocket can be found by using the basic relationship between speed (v), time (t) and distance (S):

v=\frac{S}{t}

Rearranging the equation, we can write

S=vt

In this problem, v=14000 m/s and t=150 s, so the distance travelled by the rocket is

S=vt=(14000 m/s)(150 s)=2.1 \cdot 10^6 m


2) We can solve the second part of the problem by using the same formula we used previously. This time, t=300 s, so we have:

S=vt=(14000 m/s)(300 s)=4.2 \cdot 10^6 m/s

5 0
3 years ago
elements found in the same ______ have similar chemical properties. What should go in the blank? Row or column?
Temka [501]
The answer is Column, however if you want to know the scientific word for it, it is also known as a group

(extra fact, a row is called a period)
3 0
3 years ago
A penny is dropped from the Statue of Liberty
Brrunno [24]

Answer:

a) The velocity is 2.94m/s

b) 0.441

Explanation:

a) Assume gravity is 9.8m/s^2

Use the equation below to solve for the velocity at 0.30 seconds

vf=vi+at,

vf =unknown velocity  vi= initial velocity vi=0m/s  a= 9.8m/s^2 t=0.30seconds

Step 1: Substitute the variables with the knowns

vf=0m/s+(9.8m/s^2)*0.30seconds

Step 2: Solve

vf=2.94m/s

b)

Use the equation below to solve for the displacement at 0.30 seconds

x=vit+\frac{1}{2} at^{2}

Step 1: Substitute the same variables with the knowns

x=\frac{1}{2}*(9.8m/s^2)*(0.30seconds)^{2}

Note that vi*t=0 as vi=0m/s

Step 2: Solve

x=0.441m

5 0
2 years ago
In track, there is a 1500 meter event. Is this distance more or less than a mile?
fenix001 [56]
Less than because a mile is 1600 meters
5 0
3 years ago
Q11) If you were standing at the top of a building and you dropped a rock.
Dafna1 [17]

Answer:

Part A

The distance travel by the rock is approximately 132.496 m

Part B

The speed when the rock hits the ground is approximately 50.96 m/s

Explanation:

Part A

The question is focused on the kinetics equation of a free falling object

The given parameter is the time it takes the rock to hit the ground, t = 5.2 s

For an object in free fall, we have;

h = 1/2·g·t²

Where;

h = The height from which the object is dropped

g = The acceleration due to gravity ≈ 9.8 m/s²

t = The time taken to travel the distance, h = 5.2 s

∴ h = 1/2 × 9.8 m/s² × (5.2 s)² ≈ 132.496 m

The distance travel by the rock, h ≈ 132.496 m

Part B

The speed, 'v', when the rock hits the ground, is given by the following kinematic equation,

v = g·t

∴ v = 9.8 m/s² × 5.2 s = 50.96 m/s

The speed when the rock hits the ground, v ≈ 50.96 m/s.

8 0
2 years ago
Other questions:
  • A diffraction grating has 500 slits/mm. What is the longest wavelength of light for which there will be a third-order maximum?
    14·1 answer
  • What would a boats velocity be if it would go 15kph and 18 kph?
    9·2 answers
  • A "8" grams box is pushed with a force of 100 N for 1m whereas opposing force is 10 N. A) Find the net work done on the box. B)
    13·1 answer
  • What are four types of pathogens and what type of disease or sickness do they cause?
    8·1 answer
  • A node is a point on a standing wave that has no displacement from the rest position. at the nodes, _____.
    15·2 answers
  • When are tides lowest? What causes these tides to be lowest?
    11·1 answer
  • Which quantity is most closely related to the speed of gas particles
    14·1 answer
  • How do asteroids and comets differ?
    14·1 answer
  • The components of vector A are Ax = +2.2 and Ay = -6.9 , and the components of vector B are given are Bx = -6.1 and By = -2.2. W
    6·1 answer
  • Define A Gamma Ray .....---_---__☘️​
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!