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
blagie [28]
3 years ago
10

A stone is dropped from the bridge, it takes 4s to reach the water. what's the height of the bridge?​

Physics
2 answers:
iVinArrow [24]3 years ago
6 0
Is there any other type of information?
blsea [12.9K]3 years ago
5 0

Explanation:

Using Equations of Motion :

s = ut +  \frac{1}{2} g {t}^{2}

Height = 0 * 4 + 4.9 * 16

<u>Height = 78.4 m</u>

You might be interested in
1.Suppose someone pulls a cart up a ramp a distance of 85cm along the ramp with a force of 15N.
Drupady [299]

1. 12.75 J

Assuming that the force applied is parallel to the ramp, so it is parallel to the displacement of the cart, the work done by the force is

W=Fd

where

F = 15 N is the magnitude of the force

d = 85 cm = 0.85 m is the displacement of the cart

Substituting in the formula, we get

W=(15 N)(0.85 m)=12.75 J


2. 10.6 N

In this part, the cart reaches the same vertical height as in part A. This means that the same work has been done (because the work done is equal to the gain in gravitational potential energy of the object: but if the vertical height reached is the same, then the gain in gravitational potential energy is the same, so the work done must be the same).

Therefore, the work done is

W=Fd=12.75 J

However, in this case the displacement is

d = 120 cm = 1.20 m

Therefore, the magnitude of the force in this case is

F=\frac{W}{d}=\frac{12.75 J}{1.20 m}=10.6 N

3 0
3 years ago
Ciara is swinging a 0.015 kg ball tied to a string around her head in a flat, horizontal circle. The radius of the circle is 0.5
Marat540 [252]

Answer:

Option C

Explanation:

From the question we are told that:

Mass m=0.015kg

Radius r=0.5m

Time t=0.70

Generally the equation for Tension is mathematically given by

 T=\frac{4mr}{t^2} \pi

 T=\frac{4*0.015*0.5}{(0.70)^2} (3.142)

 T=0.60N

Therefore

T=0.60 N, toward the center of the circle

Option C

3 0
3 years ago
How to find the area of the side with the maximum surface area of a rectangle
Aleks04 [339]

Answer:

Let one side = Let the other side= Let area = Let perimeter= Now substitute into area formula

Explanation:

8 0
2 years ago
Read 2 more answers
Can someone help me with these problems? ​
Paladinen [302]
120/60= 2m per s
220/55= 4m per s
720/80= 9m per s
Fastest run: 3rd run
Speed: 9m per s
Slowest: 1st run
Speed: 2m per s

3 0
2 years ago
The final position minus the initial position is the
ycow [4]

Answer:

Displacement.

Explanation:

The change in between the starting position (initial position) and your final position is the amount of distance you <em>actually </em>traveled.

For example, you can use a triangle. The distance you travel for side length a  & b is equal to the distance you travel on side c (the hypotenuse). You are pretty much solving for the hypotenuse in this case, or the displacement.

~

6 0
3 years ago
Read 2 more answers
Other questions:
  • The total units by an objects as it changes position is called _____ ?
    15·1 answer
  • What einstein discovered about space and time is that they?
    6·1 answer
  • The molar enthalpy of fusion for water is 6.008 kj/mol. what quantity of energy is released when 253g of liquid water freezes? (
    10·1 answer
  • is it true a behavior adaptation is a biochemical change within that organism that helps it survive or maintain homeostasis
    6·1 answer
  • initially at rest. The bullet is traveling 300 m/s when it hits the wood block and sticks inside it. Now the bullet and the wood
    12·1 answer
  • A center-seeking force related to acceleration is _______ force
    6·2 answers
  • Which is true about the resistivities of a metal and a semiconductor as the temperature is increased?
    8·2 answers
  • A dog running at a speed of 12 m/s has 1,080 J of kinetic energy. What is the mass of the dog
    15·1 answer
  • A metre rule is used to measure a length. Which reading is shown to the nearest millimetre? A 0.7m B 0.76m C 0.761m D 0.7614m
    5·2 answers
  • 2) Given circuit...V1= 12VR4= 5.00R7= 3.00R2= 4.00R5= 7.00R3= 5.00R6= 3.00R2a) Find the equivalent resistance of the circuit1V1R
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!