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2 years ago

2) A skier stands at rest and begins to ski downhill with an acceleration of 3.0 m/s² {downhill). What is

Physics

2 answers:

olga2289 [7]2 years ago

7 0

Answer:

her displacement s=337.5m

Explanation:

check out the above attachment ☝️

Helga [31]2 years ago

6 0

Answer:

337.5 meters

Explanation:

Df = Do + vo t + 1/2 a t^2 Df= final displ vo = original velocity

= 0 + 0 + 1/2 (3)(15^2) = 337.5 meters

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ikadub [295]

I'm pretty sure that's what cameras do, or did, back when technology wasn't as advanced.

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3 years ago

Which statement describes a surface wave?

Gekata [30.6K]

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3 years ago

A professional boxer hits his opponent with a 1035 N horizontal blow that lasts 0.175 s. The opponent's total body mass is 120 k

12345 [234]

Answer:

(a) vf = 1.51 m/s

(b) vf = 36.22 m/s

Explanation:

The rate of change of momentum is equal to the force:

$F = \frac{mv_f-mv_i}{t}$

$Ft = m(v_f-v_i)$

where,

F = Force = 1035 N

t = time = 0.175 s

vi = initial speed = 0 m /s

vf = final speed = ?

(a)

m = mass of body = 120 kg

Therefore,

$(1035\ N)(0.175\ s)=(120\ kg)(v_f - 0\ m/s)\\\\v_f = \frac{181.125\ Ns}{120\ kg} \\\\$

vf = 1.51 m/s

(b)

m = mass of head = 5 kg

Therefore,

$(1035\ N)(0.175\ s)=(5\ kg)(v_f - 0\ m/s)\\\\v_f = \frac{181.125\ Ns}{5\ kg} \\\\$

vf = 36.22 m/s

7 0

3 years ago

A 2kg object is dropped from height of 10m. ignoring air resistance calculate:

lbvjy [14]

Answer:

ME= 196.2 J

KE= 136.2

Explanation:

potential energy=mgh 2*9.81*10

Our ME is quivalent to PE as that is the toal amount of energy in the system

Kinetic energy= 1/2 m $v^{2}$

to solve for kinetic enrgy we need to use a kinaetmtic equation that help us find velocity

vf= vi+at

but we need to find time first

d=vi+1/2(accelretaion) $t^{2}$

7=0+1/2(9.81) $t^{2}$

t= 1.19 s

vf= 0+ 9.81*1.19

vf= 11.67 m/s

Now

1/2 m $v^{2}$

1/2*2* $11.67^{2}$

= 136. 2

or we could just (PE/10)*7

so (196.2/10)*7

5 0

3 years ago

In an electric shaver, the blade moves back and forth over a distance of 2.00 mm. The motion is simple harmonic, with frequency

Jlenok [28]

Answer:

(A) 0.001 m

(B) 0.75 m/s

(C) $5.7 x 10^{2} m/s^{2}$

Explanation:

distance (d) = 2 mm

frequency (f) = 120 Hz

(A) amplitude (A) = half the distance moved by the blade

amplitude = 2 / 2 = 1 mm = 0.001 m

(B) maximum blade speed (v) = ωA = 2πfA

v = 2 x 3.14 x 120 x 0.001 = 0.75 m/s

a = $(2 x 3.14 x 120)^{2}x0.001$ = $5.7 x 10^{2} m/s^{2}$

5 0

3 years ago