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
lesantik [10]
3 years ago
11

6. A boat with speed of 1.20 km/h relative to the water is heading for a dock 2.29

Physics
1 answer:
Lilit [14]3 years ago
3 0

Answer: 87 min

Explanation:

The speed of the boat S_{boat} will be its speed relative to the river S_{boat-river} plus the the speed of the river S_{river}:

S_{boat}=S_{boat-river}+S_{river} (1)

S_{boat}=1.20 km/h+0.384 km/h (2)

S_{boat}=1.584 \frac{km}{h} (3)

On the other hand, the speed of the boat is given by a relation between its traveled distance d and the time t:

S_{boat}=\frac{d}{t} (4)

Isolating t and knowing d=2.29 km:

t=\frac{d}{S_{boat}} (5)

t=\frac{2.29 km}{1.584 \frac{km}{h}} (6)

t=1.445 h \frac{60min}{1 h}=86.74 min \approx 87 min (7)

Hence the time in minutes is 87 min.

You might be interested in
When a light wave enters into a medium of different optical density,
olga nikolaevna [1]
I think it should be option (b)
6 0
3 years ago
A wheelbarrow is a good example of a second-class lever. True or False
olganol [36]

Answer:

true

Explanation:

a wheelbarrow has its load situated between the fulcrum and the force the wheel Barrow is 2nd class because of its resistance between the force and the axis

3 0
3 years ago
A vector has a magnitude of 46.0 m and points in a direction 20.0° below the positive x-axis. A second vector, , has a magnitude
irina1246 [14]

Answer with Step-by -step explanation:

We are given that

b.\mid A\mid=46 m

\theta=20^{\circ} below the positive x-axis

Therefore, the angle made by vector A in counter clockwise direction when measure from positive x-axis=x=360-20=340^{\circ}

x-component of vector A=A_x=\mid A\mid cosx=46cos 340=46\times 0.94=43.24

y-Component of vector A=A_y=\mid A\mid sinx=46sin340=46(-0.34)=-15.64

Magnitude of vector B=86 m

The vector B makes angle with positive x- axis=x'=42^{\circ}

x-component of vector B=B_x=86cos42=63.64

y-Component of vector B=B_y=86sin42=57.62

Vector A=A_xi+A_yj=43.24i-15.64j

Vector B=B_xi+B_yj=63.64i+57.62j

Vector C=A+B

Substitute the values

C=43.24i-15.64j+63.64i+57.62j

C=106.88i+41.98j

c.Direction=\theta=tan^{-1}(\frac{y}{x})=tan^{-1}(\frac{41.98}{106.88})=21.5^{\circ}

The direction of the vector C=21.5 degree

6 0
3 years ago
Indicate whether the statement is true or false. A force can be simply defined as a push or a pull.
Sidana [21]
This B: False, because the definition is lacking.  

Force is when two objects interact with one another causing it to either move or not move. In our daily lives there are a lot of times force is exerted upon us, rather force is everywhere and here are the evidences:  

*Pushing a cart
*Pushing a wall
*Hitting a baseball bat
*Apple falling down from a tree.
*Balls hitting one another
*A swinging pendulum
*Throwing a paper with stone above it
*Breaking of glass in the floor
*Falling of leaves on the grass <span> </span>
5 0
3 years ago
Air "breaks down" when the electric field strength reaches 3×106n/c, causing a spark. a parallel-plate capacitor is made from tw
aalyn [17]
Ok, I think this is right but I am not sure:
 Q = ϵ
 0AE
A= π π
 r^2

=(8.85x10^-12 C^2/Nm^2)
( π π (0.02m)^2)
(3x10^6 N/C) =3.3x10^-8 C = 33nC N = Q/e = (3.3x10^-8 C)/(1.60x10^-19 C/electron) = 2.1x10^11 electrons


4 0
3 years ago
Other questions:
  • A bicyclist of mass 85 kg rides in a circle at a speed of 4.5 m/s. If the radius of the circle is 8 m, what is the centripetal f
    10·2 answers
  • If the graph represents speed, what is measured on the x and y axes? You need to specifically identify which axis is which.
    6·1 answer
  • If a 75-kg skater starts his skate at 8.0m, at his lowest point (height = 0), what is
    9·1 answer
  • a particle of mass m sits at rest at x = 0. At time t = 0 a force given by F = Fe^(-t/T) is applied in the +x direction; F and T
    11·1 answer
  • A person tosses a ball from the ground up into the air at an initial speed of 10 m/sec and an initial angle of 43◦ off the groun
    8·1 answer
  • Name the two spectral windows through which electromagnetic radiation easily reaches the surface of earth and describe the large
    8·1 answer
  • ____is the distance traveled during a specific unit of time
    7·1 answer
  • One problem that fireplace designers try to solve is how to get more of the fire's heat into the room. Where does the rest of th
    13·1 answer
  • The greater the mass of an object
    8·1 answer
  • 1- what is a machine?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!