A student throws a rock horizontally from the edge of a cliff that is 20 m high. The rock has an initial speed of 10 m/s. If air resistance is negligible, the distance from the base of the cliff to where the rock hits the level ground below the cliff is most nearlya.5m
b.10m
c.20m
d.40m
e.200m

Answers

Answer 1

Answer:

Answer:

c.20

Explanation:

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Four landing sites are proposed for a lander. Data about the sites are listed in the table.A 3 column table with 4 rows. The first column is labeled landing site with entries W, X, Y, Z. The second column is labeled height above surface in meters with entries 32, 16, 35, 12. The last column is labeled acceleration due to gravity in meters per second squared with entries 1.6, 3.7, 1.6, 3.7. At which landing site would the lander have the greatest amount of gravitational potential energy? A. W B. X C. Y D. Z
400J of heat is produced in 4 sec in 4ohm resistor.calculate yhe PD across the resistor.
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You are at the Super Bowl. The coach puts you in during the 4th quarter to be the quarterback to secure your team the win. Since you are fresh off the bench, you are able to throw the ball with more force than the last person. What advantages, using Newton's second law, will this have when playing?

Answers

Answer:

the ball will fly faster, and longer distance, which means there is going to be less air resistnace friction acting upon the ball.

Explanation:

F = ma

Force = mass x acceleration

Mass of football remains constant, fresh arm of QB provides higher acceleration.

Ball will get to receiver faster.

What is the kinetic energy of a 1.40 kg discus with a speed of 22.5 m/s?

Answers

The kinetic energy of a 1.40 kg discus with a speed of 22.5 m/s is 354.375 joule.

What is kinetic energy?

The energy that an object has because it is moving is known as kinetic energy in physics. It is described as the amount of effort required to accelerate a body of a specific mass from rest to its specified velocity. The body keeps its kinetic energy after gaining it during acceleration, barring changes in speed.

Up until a change in speed, the body maintains the kinetic energy it gained during acceleration.

Mass of the discus: M = 1.40 kg.

Speed of the discus: v = 22.5 m/s.

Hence, the kinetic energy of the discus= 1/2×Mv²

= 1/2 × 1.40 × 22.5² joule

= 354.375 joule.

Hence, the kinetic energy of a 1.40 kg discus with a speed of 22.5 m/s is 354.375 joule.

Learn more about kinetic energy here:

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apply E=(mv^2)/2 . It will give the answer.

A total solar eclipse is visible froma. all over Earth.
b. only within the moon’s umbra.
c. only within the moon’s penumbra.
d. only the dark side of Earth.

Answers

Answer:

b. only within the moon’s umbra.

Explanation:

Solar eclipse occurs when Moon comes between the Sun and the Earth in straight line and blocks the sunlight. A shadow of moon castes on the surface of the Earth. The region passing through the moon's umbra would view a total solar eclipse. The moon completely hides the surface of the sun. It would be visible to the people residing in the bright side of the Earth within the Umbra of the moon.

Only within the umbra of the moon's shadow.

Because light travels in a straight line and casts a shadow, Isaac Newton hypothesized that light isA. radiation.
B. a stream of particles.
C. a wave.
D. heat.

Answers

B. A stream of particles, or otherwise known as photons, small pieces of light. All of the rest of the options could never make a shadow.

The captain told the passengers that the plane is flying at 450 miles per hour this information describes the planeVelocity
Speed
Acceleration
Direction

Answers

Answer:

The correct answer is speed.

Explanation:

Time rate of change in distance is called as speed. On the other hand, time rate of change in displacement is called velocity. The captain told time rate of change in distance (450 miles/hour) because he did not mention the direction. Hence, 450 miles/hour describes the speed of the plane. We do not identify any relation of this information with direction and acceleration.

speed, why velocity has direction acceleration Is a change in speed and it doesn't give a direction so it's speed

A shear force of 400 N is applied to one face of an aluminum cube with sides of 30 cm. What is the resulting relative displacement? (the shear modulus for aluminum is 2.5 X 1010N/m2).a) 4.4 X 10-8 m
b) 8.2 X 10-8 m
c) 1.9 X 10-8 m
d) 5.3 X 10-8 m