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
alexdok [17]
4 years ago
9

A ball is thrown straight upward and rises to a maximum height of 18.0 m above its launch point. at what height above its launch

point has the speed of the ball decreased to one-half of its initial value?
Physics
1 answer:
slava [35]4 years ago
5 0

A ball is thrown straight upward and rises to a maximum height of 18.0 m

above its launch point. at what height above its launch point has the

speed of the ball decreased to one-half of its initial value?

-----------------------

kinematic equation

v^2=u^2-2as; v0=,s=18,a=-10m/s/s

u=root 360


(u/2)^2=u^2-2as

=>s=13.5m

You might be interested in
An object is allowed to fall freely near the surface of a planet. The object has an acceleration due to gravity of 24 m/s2. How
Alborosie

Answer:

12 m

Explanation:

The object is in uniformly accelerated motion, so the distance covered can be found using the following suvat equation:

s=ut+\frac{1}{2}at^2

where

s is the distance

u is the initial velocity

t is the time

a is the acceleration

For this problem,

g=24 m/s^2

and

u = 0, since we are considering the first second of motion

So, substituting t = 1 s, we find

s=0+\frac{1}{2}(24)(1)^2=12 m

6 0
3 years ago
Burning oil and coal adds to the atmosphere.
True [87]

Answer:

carbon dioxide

Explanation:

8 0
4 years ago
The first electric generators used direct current, so they needed to be reversed manually on a regular basis in order to work pr
djyliett [7]
Could I see the questions
4 0
3 years ago
A generator is designed to produce a maximum emf of 190 V while rotating with an angular speed of 3800 rpm. Each coil of the gen
Zinaida [17]

Answer:

The number of turns of wire needed is 573.8 turns

Explanation:

Given;

maximum emf of the generator, = 190 V

angular speed of the generator, ω = 3800 rev/min =

area of the coil, A = 0.016 m²

magnetic field, B = 0.052 T

The number of turns of the generator is calculated as;

emf = NABω

where;

N is the number of turns

\omega = 3800 \frac{rev}{min} \times \frac{2\pi}{1 \ rev} \times \frac{1 \min}{60 \ s } = 397.99 \ rad/s

N = \frac{emf}{AB\omega } \\\\N = \frac{190}{0.016 \times 0.052\times 397.99} \\\\N = 573.8 \ turns

Therefore, the number of turns of wire needed is 573.8 turns

4 0
3 years ago
I don’t know why it glitches like that???? I need help tho...brainliest for best answer
lara31 [8.8K]

Answer:

B. They each contain the same amount of matter.

Explanation:

Scientifically, mass is the amount of matter in an object.

A. Whether an object is big or small does not mean that it will be a certain mass. If you have two objects that are the same size, the denser object will have more mass, and the less dense object will have less mass.

C. The amount of space an object takes up is called the volume.

D. Different combinations and amounts of elements can give you the same mass. Rocks, books and cans of soda are made of different things.

8 0
3 years ago
Other questions:
  • What is a change that will not affect the pressure in a container
    6·2 answers
  • Help me Plaese
    15·1 answer
  • Question 11 of 11 | Page 11 of 11
    13·1 answer
  • A fisherman fishing from a pier observes that the float on his line bobs up and down, taking 2.4 s to move from its highest poin
    13·1 answer
  • Please need help on this
    8·1 answer
  • Masses are stacked on top of the block until the top of the block is level with the waterline. This requires 20 g of mass. What
    6·1 answer
  • Which of these forces could speed up a baseball?
    15·2 answers
  • Which of the following is MOST needed for cosmologists to study the age of the universe? A. Energy levels B. Static C. Size D. D
    5·2 answers
  • If you run with an average speed of 3.9 meters per second for 1,200 seconds, then what distance will you have traveled?
    12·1 answer
  • Can someone see if it's right? thank you. ​
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!