03/19/21

Height of the ball above ground level
John throws a ball straight up into the air at 50 ft/sec while standing on top of a 300ft tower. a) write an algebraic expression that describes the height of the ball above ground level t seconds... more
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03/18/21

Calculate the size and direction of the forces acting on the example
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03/18/21

A window in a skyscraper has a surface area of 3.50 m2. Wind rushes by the outside of the window at 17.4 m/s, while inside the air is stationary. What is the TOTAL force acting on the window?
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03/17/21

Wind blows over the top of a 10.0 m tall chimney at 12.7 m/s. The air at the bottom of the chimney is stationary. What is the difference in air pressure between the top and bottom of the chimney?
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03/16/21

A .5kg firecracker is ignited and then thrown into the air at 16m/s. Aprox. 1.2 seconds later, the firecracker explodes. What is the net momentum of the firecracker pieces after it explodes?
A .5kg firecracker is ignited and then thrown into the air at 16m/s. Aprox. 1.2 seconds later, the firecracker explodes. What is the net momentum of the firecracker pieces after it explodes?
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03/16/21

Bumper car A (281 kg) moving +2.82 m/s makes an elastic collision with bumper car B (209 kg) moving -1.72 m/s. What is the velocity of car b after the collision?
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03/13/21

Find the voltage induced across a coil of 22mH if the rate of change of current through the coil is...
Find the voltage induced across a coil of 22mH if the rate of change of current through the coil is...a.) 1 A/sb.) 1 mA / msc.) 2 mA / 10 μs
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03/12/21

Two narrow, parallel slits are illuminated with yellow light ( = 578 nm) produced by a copper laser and light of an unknown wavelength ’ produced by another laser.

Two narrow, parallel slits are illuminated with yellow light (λ = 578 nm) produced by a copper laser and light of an unknown wavelength λ’ produced by another laser. Find λ’ knowing that the 6 th... more
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03/11/21

Linear Algebra (Gauss Jordan reduction)
Klein, Jillan and Jielaine assembled 741 newsletters for distribution to students. Klein could assemble 124/h, Jillan 118/hr while Jielaine 132/hr. One morning, the three volunteers worked a total... more
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03/11/21

math precalculus

Point P(3,5) is on the terminal arm of angle θ in standard position. calculate sin θ
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03/11/21

math precalculus
Write the equation of the parabola in the form: y = a (x - h)2 + with vertex (-4,0) and a = -1.
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03/10/21

I need to find the equation. I got them wrong for the first time. So i need help!!!
A spring is attached to the ceiling and pulled 14 cm down from equilibrium and released. After 4 seconds the amplitude has decreased to 13 cm. The spring oscillates 20 times each second. Assume... more
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03/09/21

I have a problem and I don't know how I solve it. Can anyone help me?

Question: to find the height of a fire tower, Lisa places a mirror on the ground 40 ft. from the base of the tower. Lisa's eye are 51/2 above the ground. When Lisa stands 4 ft. from the mirror, she... more
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03/09/21

When you weigh yourself on good old terra firma (solid ground), your weight is 535 N . In an elevator your apparent weight is 470 N .
What is the magnitude of the elevator's acceleration?What is the direction of the elevator's acceleration?
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03/09/21

Three identical blocks connected by ideal (massless) strings are being pulled along a horizontal frictionless surface by a horizontal force F⃗ . (Figure 1)
The magnitude of the tension in the string between blocks B and C is  = 3.00  . Assume that each block has mass  = 0.400  . What is the magnitude of the force? What is the tension in the string... more
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03/08/21

(Q.4) An object moving in a straight line travels s(t) kilometers in t​ hours, where s(t) = 7t^2 + t.
​(a) What is the​ object's velocity when t = 6​? _______ (Answer).​(b) How far has the object traveled in 6 hours? _______ (Answer).​(c) When is the object traveling at a rate of 6 km/h? _______... more
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03/08/21

The perimeter of the quadrilateral is 46 centimeters. Find the length of each side
Side 1- x+5side 2- x+8side 3- x^2-2x side 4- 2x-2
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03/06/21

Force of Gravity
A 3kg object is located at a distance of 8500000m from the center of a larger object whose mass is 9E+24kg. What is the size of the force acting on the smaller object?
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03/06/21

Force of Gravity
Two spherical objects have masses of 450000kg and 950kg. Their centers are separated by a distance of 1700m. Find the gravitational attraction between them. 
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03/02/21

Resistors and power supply

A 1.0 Ω and 2.0 Ω resistor are connected in series to a 12 V power supply. Then a third resistor is connected in parallel with the 2 Ω resistor. What will happen to the current through the power... more
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03/01/21

A 81-kg sprinter wishes to accelerate from rest to a speed of 11 m/s in a distance of 29 m . What coefficient of static friction is required between the sprinter's shoes and the track?
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03/01/21

A 1.2 kg block is placed on a spring with a spring constant of 665 N/m. What would the period of oscillation of this system be? 0.0425 s 0.0425 s 0.267 s 0.267 s 798 s 798 s 554 s 554 s
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03/01/21

In a triangle, a catheter is 7.5 cm and the hypotenuse is 12.0 cm. Determine the angles of the triangle
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02/28/21

A 200 ft. guywire is attached to the top of a tower. If the wire makes a 55 degree angle with the ground, how tall is the tower?
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02/28/21

Solve the right triangle: B = 72° b= 24 cm
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