A 4,000-kg car traveling at 20m/s hits a wall with a force of 80,000 N and comes to a stop. What was the impact time?
Answers
(m*v-m*u)/t = F
4000*20/t = 80000 (note: v is zero as it stopped)
soo, t = 1 sec
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The diagram below shows the location of three stars in space.The light from Star 2 reaches Star 1 in 63 years. If Star 3 is 75 light years from Star 2, which of these conclusions about the stars is correct? (2 points)Star 2 is 75 miles away from Star 3.Star 2 is 63 kilometers away from Star 3.Star 1 is 12 light years away from Star 3.Star 1 is 138 light years away from Star 3.
PLEASE HELP, I NEED THIS ANSWERED!
Answers
The speed of anything that covers 42 meters in 7 seconds is
(42 meters) / (7.0 seconds)
= (42 / 7.0) (meters/second)
= 6.0 m/s .
Answer:
6.0 m/s
Explanation:
A water wave travels across a 42-meter wide pond in 7.0 seconds. The speed of the wave is _____.
292 m/s
49 m/s
6.0 m/s
0.17 m/s
Answers
Scientists know that seismic waves can be either compressional or transverse because there are horizontal and vertical movements during an earthquake. Horizontal movements are compressional while vertical movements are transverse.
Thank you!
B) increase in severity of hurricanes
C) long-term electrical power generation
D) improvement in satellite communication
Answers
Solar prominences themselves are of no concern because they are visible in the Hydrogen Alpha wavelength. They are anchored in place by magnetic fields. When these fields break or reconnect, it can send the plasma that makes up the prominence away from the sun. If one of these clouds impacts Earth, they are called CMEs or coronal mass ejections. Depending on the magnetic orientation of the cloud with respect to Earth's the CME can break down our magnetic field resulting in geomagnetic storms, aurorae, power grid fluctuations, and particle radiation near the poles, satellite single upset events, and radio blackouts.
Thus, letter a is the answer.
Answer:
A) rerouting of aircraft
Explanation:
Answers
even WITHOUT seeing the choices.
Time = (displacement) / (magnitude of average velocity) .
Answers
Answer:
Ions are formed by the addition of electrons to, or the removal of electrons from, neutral atoms or molecules or other ions; by a combination of ions with other particles; or by rupture of a covalent bond between two atoms in such a way that both of the electrons of the bond are left in association with one of the formerly bonded atoms.
Explanation:
Answer:
Ion, any atom or group of atoms that bears one or more positive or negative electrical charges. Positively charged ions are called cations; negatively charged ions, anions. Ions are formed by the addition of electrons to, or the removal of electrons from, neutral atoms or molecules or other ions; by combination of ions with other particles; or by rupture of a covalent bond between two atoms in such a way that both of the electrons of the bond are left in association with one of the formerly bonded atoms. Examples of these processes include the reaction of a sodium atom with a chlorine atom to form a sodium cation and a chloride anion; the addition of a hydrogen cation to an ammonia molecule to form an ammonium cation; and the dissociation of a water molecule to form a hydrogen cation and a hydroxide anion.
Explanation:hope dis helps u
Answers
A person who is not wearing a seatbelt during a collision will be thrown forward because it maintains forward motion
Further explanation
In Newton's law, it is stated that if the resultant force acting on an object of magnitude is zero, it can be formulated :
then the object tends to defend itself from its state. So for objects in a state of movement, objects tend to move forever. Likewise, for objects in a state of rest, they tend to remain forever. The tendency of objects like this is called inertia
The size of inertia is proportional to mass, the greater the mass of the object, the greater the inertia of the object.
In objects with mass m that move translatively, the object will maintain its linear velocity
When we are in a vehicle that moves forward, then we will still maintain a state of forwarding motion. If our vehicle stops suddenly, then we keep moving forward so we will be pushed forward. From this point, the use of a safety belt serves to hold back our movements so that there are no fatal accidents or collisions.
Learn more
Newton's law of inertia
example of Newton's First Law of inertia
law of motion
Keywords: inertia, Newton's First Law
The person not wearing the seat-belt during a collision may hit the dashboard of the car very hard and this injury might be fatal.
Explanation:
The inertia of a body is a property contained by the body by virtue of its mass. Higher the mass of a body, higher will be the inertia.
According to the Newton's first law of motion i.e. law of Inertia, a body continues to be in its state of rest or motion until and unless an external force acts on the body to change its state.
When a car is moving on a road, the car is in motion and the body of the person in the car is also in the motion along with the car. Now if the car faces any collision, the car will suddenly come to rest.
But the body of the person sitting in the car continues to be in motion as there is no external force acting on the body. If the person is not wearing the seat-belt, the body moves forward and the person may hit the dashboard very hard.
The seat-belt stops the person's body to move ahead and hit the dashboard. So, the seat-belt prevents the person from injury by stopping the body.
Thus, The person not wearing the seat-belt during a collision may hit the dashboard of the car very hard and this injury might be fatal.
Learn More:
1. The component of a lever brainly.com/question/1073452
2. The kinetic energy of a body depends on brainly.com/question/137098
3. How long to walk 2000 miles brainly.com/question/3785992
Answer Details:
Grade: High School
Subject: Physics
Chapter: Laws of Motion
Keywords:
inertia, law of motion, newton's law, seat-belt, collision, wearing, dashboard, injury, external force, rest, motion.