Physics, 20.07.2019 02:30 monayemcnett11

Lacie kicks a football from ground level at a velocity of 13.9 m/s and at an angle of 25.0° to the ground. you have determined that the football would travel 15.1 m before landing. how would this value change if the football was kicked at an angle of 35.0°? complete all equations without rounding and then round to the nearest tenth at the end.

Answers: 2

Show answers

Answers

If the football is kicked at a 35.0º angle, it will travel 18.5 m before landing. This is farther than if it were kicked at a 25° angle.

Answer from: Ashtree519

The horizontal distance traveled by the ball (range of motion) is given by the following equation:

$x= v_{0x} t$

In which

is the range of motion, $v_{0x}$ is the horizontal component of the initial velocity, and

is the time of motion.

First, lets calculate the horizontal component of the initial velocity:

$v_{0x}= v_{0}cos( \alpha)=13.9cos(35)=11.39$

Now, we calculate the time of motion from the equation that described the motion of the ball in the vertical axis:

$y= \frac{1}{2}at^2+ v_{0y}t$

In which

is the position of the ball vertically, $v_{0y}$ is the vertical component of the initial velocity,

is the acceleration in the vertical axis (which is gravity), and

is time of motion.

We want to find the time when the ball lands, hence, when y=0

; so the equation becomes:

$0= \frac{1}{2}at^2+ v_{0y}t=\frac{1}{2}at^2+ v_{0}sin( \alpha )t=\frac{1}{2}(-9.8)t^2+ 13.9sin(35 )t$

We rewrite it a bit more:

-4.9t^2+7.97t=0

This is a quadratic equation, so we use the quadratic equation formula to solve for time (we'll get two answers):

$t= -\frac{1}{9.8} [{-7.97}+-\sqrt{(7.97)^2}]$

Clearly, one of the answers is t=0

, this is before you kick the ball (it is on the ground), we want the nonzero answer (when it lands) so:

$t= -\frac{1}{9.8} ({-7.97}-7.97})=1.63$

Now, we plug-in the time value to the equation of the motion's range:

$x= v_{0x} t=(11.39)(1.63)=18.57$

The ball will travel 18.57 meters.

Answer from: Quest

a.) travels faster in solids because the particles are closer together.

air is a gas water is a liquid

Answer from: Quest

gpe = mass x gravity constant x height or… gpe = mgh

where… mass: measured in kilograms (kg)

gravity: gravity constant on earth = 10.00 m/s2

height: measured in meters (m)

gpe: measured in joules (j) or kilojoules (kj)

how do you solve gpe?

gravitational potential energy (gpe) is the energy an object has because of its position above the. ground.

gpe = mass x gravity constant x height or… gpe = mgh.

mass:

note: to earn full marks when solving science word problems, you must show your work:

formula.

example:

given values:

mass = 0.3 kg.

Another question on Physics

Physics, 22.06.2019 03:30

Scout feels ill one day before school. her mother puts a thermometer in her mouth and the temperature begins to climb to 100°f. what is happening between the cooler thermometer and scout's body? a) scout's body is applying a force to the particles in the thermometer. b) kinetic energy is being transferred from her mouth to the thermometer. c) potential energy is being lost by the thermometer and gained by scout's body. d) the potential energy stored in foods is converted to mechanical energy to raise the mercury in the thermometer.

Answers: 1

Answer

Physics, 22.06.2019 11:30

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?

Answers: 1

Answer

Physics, 23.06.2019 01:00

What do we mean by the event horizon of a black hole?

Answers: 1

Answer

Physics, 23.06.2019 02:00

Estimate the kinetic energy of mars with respect to the sun as the sum of two terms, that due to its daily rotation about its axis, and that due to its yearly revolution about the sun. (assume mars is a uniform sphere with mass = 6.4×10 to the power of 23 kg, radius = 3.4×10 to the power of 6 m, rotation period = 24.7 hours, orbital period = 686 days and is 2.3×10 to the power of 8 km from the sun.)

Answers: 2

Answer

You know the right answer?

Lacie kicks a football from ground level at a velocity of 13.9 m/s and at an angle of 25.0° to the g...

Questions