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
slava [35]
3 years ago
8

2. (Free-fall problem) A ball is thrown up in the air. 10 seconds later it reaches the top of its trajectory. What was the origi

nal velocity it was thrown upward with?​
Physics
1 answer:
Sever21 [200]3 years ago
8 0

Explanation:

Using kinematics,

t = 10s

v = 0m/s

a = -9.8m/s^2

Therefore u = v - at = 0 - (-9.8)(10) = 98m/s.

You might be interested in
A house has well-insulated walls. It contains a volume of 105 m3 of air at 305 K.
REY [17]

Answer: 85.46\ kJ

Explanation:

Given

Volume of air V=105\ m^3

Temperature of air T=305\ K

Increase in temperature \Delta T=0.7^{\circ}C

Specific heat for diatomic gas is C_p=\dfrac{7R}{2}

Energy required to increase the temperature is

\Rightarrow Q=nC_pdT\\\\\Rightarrow Q=n\times \dfrac{7R}{2}\times \Delta T\\\\\Rightarrow Q=\dfrac{7}{2}nR\Delta T\\\\\Rightarrow Q=\dfrac{7}{2}\times \dfrac{PV}{T}\times \Delta T\quad [\text{using PV=nRT}]

Insert the values

\Rightarrow Q=\dfrac{7}{2}\times \dfrac{1.01325\times 10^5\times 105}{305}\times 0.7\\ \text{Assuming air pressure to be atmospheric P=}1.01325\times 10^5\ N/m^2\\\\\Rightarrow Q=0.8546\times 10^5\\\Rightarrow Q=85.46\ kJ

6 0
3 years ago
Acceleration refers to any changes in
Reptile [31]

Answer:

speed

Explanation:

6 0
2 years ago
Why shouldnt u cram for a skills test?
Angelina_Jolie [31]

Because your brain cant handle all of the information.

5 0
3 years ago
Why can’t we see black holes? Question 11 options: A.Because they don't want to be seen. B.Because the sun is too far away from
Vika [28.1K]

We can't see black holes because D) no light can get out

Explanation:

Black holes are the result of the gravitational collapse of a supermassive star.

The life of a supermassive star ends with a huge explosion, called supernova, that leaves behing a super-dense core called black hole.

Black holes are the most dense objects of the universe, having a huge mass in a super small size. For this reason, the gravitational force exerted by a black hole in its proximity is so strong that even light is not able to escape from the gravitational field. For this reason, light from a black hole is not able to reach us, and so we are not able to see these objects.

The "edge" of space beyond which light remains "trapped" inside the black hole is called event horizon, and no object can escape this region of space.

The radius of the event horizon of a black hole is called Schwarzschild radius and it is given by:

r=\frac{2GM}{c^2}

where

G is the gravitational constant

M is the mass of the black hole

c is the speed of light

Learn more about space:

brainly.com/question/2887352

brainly.com/question/10934170

#LearnwithBrainly

6 0
3 years ago
Infrared light has a longer wavelength than WHAT? but a shorter wavelength than WHAT?
umka21 [38]

Infrared light has longer wavelengths than gamma rays, X-rays, ultraviolet light, and visible light, but shorter wavelengths than microwaves, radar, GPS, cellphone, TV, radio, ocean, audible sound, ultrasound, seismic, guitar-string, and Slinky™ waves.

7 0
3 years ago
Read 2 more answers
Other questions:
  • which step of the scientific method relies more heavily on newly collected data than on creativity and innovation?
    15·1 answer
  • A diver running 2.2 m/s drives out horizontally from the edge of a vertical cliff and 2.9 s
    14·1 answer
  • Linda is a forensic scientist arriving at the crime scene. What must she do before she can examine the crime scene?
    11·2 answers
  • Railroad cars are loosely coupled so that there is a noticeable time delay from the time the first and last car is moved from re
    6·1 answer
  • Waves will have the highest speed in_
    8·1 answer
  • A 200-Ω resistor is connected in series with a 10-µF capacitor and a 60-Hz, 120-V (rms) line voltage. If electrical energy costs
    15·1 answer
  • 1. In this activity, you will be looking for a relationship between the mass of the cart and the acceleration of the cart.
    8·1 answer
  • A painter stands a horizontal platform which has a mass of 20kg and is 5m long, the platform is suspended by two vertical ropes
    15·1 answer
  • What is the mass of an object if a force of 2N and gives it an acceleration of 2 m/s2​
    6·1 answer
  • A meteor is falling towards the earth. The mass and the radius of the earth is 6×10^24 kg and 6.4×10^3 km respectively. What is
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!