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
Vsevolod [243]
3 years ago
11

An 80-kg quarterback jumps straight up in the air right before throwing a 0.43-kg football horizontally at 15 m/s . How fast wil

l he be moving backward just after releasing the ball?PLEASE SORT QUESTION BELOWSort the following quantities as known or unknown. Take the horizontal direction to be along the x axis.mQ: the mass of the quarterbackmB: the mass of the football(vQx)i: the horizontal velocity of quarterback before throwing the ball(vBx)i: the horizontal velocity of football before being thrown(vQx)f: the horizontal velocity of quarterback after throwing the ball(vBx)f: the horizontal velocity of football after being thrown
Physics
1 answer:
viktelen [127]3 years ago
5 0

Answer:

a

The speed of the quarterback backward is v_q =  0.08 \ m/s

b

Known are

 m_Q , m_B , (v_{Bx})_i  (v_{Qx})_f, (v_{Bx})_f

Unknown

   (v_{Qx})_f

Explanation:

From the question we are told that

   The mass of the quarterback is m_Q =  80 \ kg

    The mass of the ball is m_B =  0.43 \ kg

     The speed of the ball is  v_{B x}=  15 \ m/s

The law of momentum conservation can be mathematically represented as

       m_Q u_{Qx} + m_Bu_{Bx}  =  - m_{Q} v_{Qx} + m_B v_{Bx}

Now at initial both ball and quarterback are at rest and the negative sign signify that the quarterback moved backwards after throwing the ball

  So

       m_Q v_{Qx} =  m_B v_ {Bx}

=>     v_{Qx} =  \frac{m_Bv_{Bx}}{m_Q}

substituting values

        v_q =  \frac{0.43 * 15}{80}

       v_q =  0.08 \ m/s

You might be interested in
A cheetah can run 113 km/h in short busts. How far can a cheetah run in 0.25 hours (15 minutes)?
Fofino [41]
The cheetah can run 28,25 km
4 0
3 years ago
How does respiratory and nervous interconnected <br><br> I will make brainlest!!
stiv31 [10]
The medulla in the brain controls the breathing rate in the lungs
4 0
3 years ago
What mRNA sequence would result from the following DNA sequence?
Nezavi [6.7K]

Answer:

UAC CUG AGG AUC

Explanation:

<em>The mRNA sequence from ATG GAC TCC TAG DNA sequence would be </em><em>UAC CUG AGG AUC.</em>

<u>According to Chargaff's base pairing rule, the purine bases always pair with pyrimidine bases. Specifically, Adenine base must pair with Thymine base while Guanine base must pair with Cytosine base. In RNA, Thymine base is replaced with Uracil base.</u>

Hence:

ATG   GAC   TCC   TAG will pair with

UAC   CUG   AGG   AUC

5 0
3 years ago
Oil having a density of 930 kg/m^3 floats on
Zolol [24]

Answer:

0.0268 m

Explanation:

Draw a free body diagram of the block.  There are three forces: weight force mg pulling down, buoyancy of the oil B₁ pushing up, and buoyancy of the water B₂ pushing up.

Sum of forces in the y direction:

∑F = ma

B₁ + B₂ − mg = 0

ρ₁V₁g + ρ₂V₂g − mg = 0

ρ₁V₁ + ρ₂V₂ = m

ρ₁V₁ + ρ₂V₂ = ρV

ρ₁Ah₁ + ρ₂Ah₂ = ρAh

ρ₁h₁ + ρ₂h₂ = ρh

(930 kg/m³)h₁ + (1000 kg/m³)h₂ = (968 kg/m³) (4.93 cm)

Since the block is fully submerged, h₁ + h₂ = 4.93 cm.

(930 kg/m³) (4.93 cm − h₂) + (1000 kg/m³)h₂ = (968 kg/m³) (4.93 cm)

h₂ = 2.68 cm

h₂ = 0.0268 m

4 0
3 years ago
A car is traveling at 15m/s on a horizontal road. the brakes are applied and the car skids to a stop in 4.0s . the coefficient o
iren2701 [21]

Answer:

the coefficient of Kinetic friction between the tires and road is 0.38

Option A) .38 is the correct answer

Explanation:

Given that;

final velocity v = 0

initial velocity u = 15m/s

time taken t = 4 s

acceleration  a = ?

from the equation of motion        

v   =   u   +   at

we substitute

0 = 15 + a × 4

acceleration a = -15/4 =  - 3.75 m/s²    

the negative sign tells us that its a  deacceleration so the sign can be ignored.

Deacceleration due to friction a = μ × g

we substitute

3.75 = μ × 9.8    

μ = 3.75 / 9.8 = 0.3826 ≈ 0.38

Therefore the coefficient of Kinetic friction between the tires and road is 0.38

Option A) .38 is the correct answer

8 0
3 years ago
Other questions:
  • Calculate the force of gravity between a 2.50 kg newborn baby and a 80.0 kg doctor standing 0.250 m away. G = 6.67 E -11 N*m2/kg
    12·1 answer
  • What kind of movement does the heat within the core and mantle directly generate?
    10·1 answer
  • What caused earths continents to drift apart?
    5·2 answers
  • A hydrometre with a uniform cross-sectional area floats in a liquid of density 0.80cm^-3.If the hydrometre wieighs 100.0g and ha
    7·1 answer
  • What is the use of scientific knowledge and research for an action
    7·1 answer
  • A rescue helicopter is hovering over a person whose boat has sunk. One of the rescuers throws a life preserver straight down to
    8·1 answer
  • What is the process of cell division that results in the creation of four sex cells? A. budding B. fertilization C. meiosis D. m
    6·2 answers
  • Can a soccer goalkeeper score a goal in his own goal.
    9·1 answer
  • Where are electrons with the lowest energy found?
    13·2 answers
  • 알맞은 단어로 빈칸 채우기
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!