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
lina2011 [118]
3 years ago
9

A ball is thrown downward with an initial speed of 7m/s. the balls velocity after 3 seconds is m/s

Physics
2 answers:
Gnom [1K]3 years ago
5 0

Answer: -36.4

Explanation:

It says that the initial speed is 7 and the time is 3. acceleration is -9.8 ( its always 9.8 but since its going downward its negative)

The equation you want to use is Vf = Vo + AT.

When you plug in the answers it is

0 = 7 + -9.8(3)

-9.8(3) = -29.4

Then add 7

and you get -36.4

ycow [4]3 years ago
4 0

Answer:

velocity = distance / time

distance = speed * time

Distance= 7*3 = 21

V = 21/3

V = 7

Explanation:

You might be interested in
​A piston–cylinder assembly contains 5.0 kg of air, initially at 2.0 bar, 30 oC. The air undergoes a process to a state where th
vlada-n [284]

Answer:

Explanation:

The process is isothermic,  as P V = constant .

work done = 2.303 n RT log P₁ / P₂

= 2.303 x 5 / 29 x 8.3 x 303  log 2 / 1 kJ

= 300.5k J

This energy in work done by the gas will come fro heat supplied as internal energy is constant due to constant temperature.

heat supplied  = 300.5k J

specific volume is volume per unit mass

v / m

pv = n RT

pv  = m / M  RT

v / m = RT / p M

specific volume = RT / p M

option B is correct.

5 0
3 years ago
Find the ratio of the lengths of the two mathematical pendulums, if the ratio of periods is 1.5​
juin [17]

Answer:

The ratio of lengths of the two mathematical pendulums is 9:4.

Explanation:

It is given that,

The ratio of periods of two pendulums is 1.5

Let the lengths be L₁ and L₂.

The time period of a simple pendulum is given by :

T=2\pi \sqrt{\dfrac{l}{g}}

or

T^2=4\pi^2\dfrac{l}{g}\\\\l=\dfrac{T^2g}{4\pi^2}

Where

l is length of the pendulum

l\propto T^2

or

\dfrac{l_1}{l_2}=(\dfrac{T_1}{T_2})^2 ....(1)

ATQ,

\dfrac{T_1}{T_2}=1.5

Put in equation (1)

\dfrac{l_1}{l_2}=(1.5)^2\\\\=\dfrac{9}{4}

So, the ratio of lengths of the two mathematical pendulums is 9:4.

3 0
3 years ago
HELP⚠️⚠️
alexgriva [62]

Answer:

I think u are traeling at speed of light and not ur friend

Explanation:

4 0
3 years ago
Read 2 more answers
a cliff diver drops from rest to the water below. how many seconds does it take for the diver to go from 0 to 60. that is to go
aleksandr82 [10.1K]
U = 0, initial vertical velocity
v = 60 mph = 88 ft/s

Ignore air resistance and take g = 32 ft/s².
It t = time to attain 60 mph, then
(88 ft/s) = (32 ft/s²)*(t s)
t = 88/32 = 2.75 s

Answer: 2.75 s
6 0
3 years ago
Find the steady-state temperature distribution for the semi-infinite plate problem
jeka94

Answer:

Savage is the answer

Explanation:  The savage people guess like me

6 0
3 years ago
Other questions:
  • What happens when the crests of two waves overlap
    13·1 answer
  • A geologist is studying rock layers in an old river bed, and he finds a fossil of a fish and a horsetail rush in the same rock l
    8·2 answers
  • PLS HELP ME OUT!!
    12·2 answers
  • Which of these statements best proves that electromagnetic forces are weaker than strong nuclear forces? Neutrons do not repel o
    11·1 answer
  • A 75-kilogram hockey player is skating across the ice at a speed of 6.0 meters per second. What is the magnitude of the average
    11·1 answer
  • Need help with these 2 questions please !!!!!!! ASAP
    13·1 answer
  • Which is the best evidence that continents that are now separated were once
    8·2 answers
  • What is the critical mass of a species?
    11·1 answer
  • Calculate the period of wave whose frequency is 50Hz​
    7·2 answers
  • A uniform plank of length 5.0 m and weight 225 N rests horizontally on two supports
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!