I am almost done with my physics homework, but i am stuck on a few problems. Can anybody help me?
Number 1 is tricky but this answer makes sense to me. 1) Cheetah: velocity=117km/h = 117000m/h = 117000/3600 m/s = 32.5m/s. Distance=velocity x time, so, s=32.5 x 30 = 975m Antelope: velocity=90km/h = 90000m/h = 90000/3600 m/s = 25m/s s=25 x 30 = 750m Subtracting the distance covered by the antelope from the distance covered by the cheetah gives : 975 - 750 = 225m, which is the answer:) 225metres. 2) Use the equations of motion where u=initial velocity, v=final velocity, s=displacement, a=acceleration, t=time. Im assuming you take acceleration due to gravity to equal 9.81m/s. a) v = u + at 0 = 13.7 + (-9.81)t 9.81t = 13.7 t=1.39s b) s = ut + 1/2at.t (t.t means t squared but i cant make 2 go superscript) s = 13.7(1.39) + 1/2(9.81)(1.39)(1.39) s = 9.57 m c) s = vt v = s/t v = 9.57/1.39 v = 6.85 m/s 3) Use the same equations of motion with the smbols meaning the same thing. a) s = vt s = 1 x 10 s = 10m b) v.v = u.u + 2as v.v = 0 + 2(9.81)(10) v.v = 196.2 v = 14m/s Hope that helps
Help! PHYSICS HOMEWORK REALLY STUCK!!!!!!!!! ACCELERATION?
v - final speed = 2m/s u - initial speed = 11m/s a - acceleration = -9.81m/s^2 t - time v=u+at 2=11-9.81t 9.81t=9 t=9/9.81 t=0.92 approximately ( i rounded off the answer to 2 significant figures)
Physics homework help?
Hello laurenzo, Your first step is to find the force that the hand is exerting Torque = Force * Distance Force = Torque/Distance Force= (91 N-m)/(0.38m) Force = 239.5 N (I am assuming that the torque is in units of N-m. Always include the units at EVERY step of a calculation, it helps eliminate mistakes.) Now we need to find the component of this force that is in the direction of the elastic. The force is 39 degrees from horizontal and the elastic is 61 degrees from the horizontal (on the other side of the vertical). So the angle between them is: 180 degrees - 39 degrees - 61 degrees Angle = 80 degrees Now, the component of the force in the direction of the elastic is: (We will call F(e) the force on the elastic and F(h) the force on the hand) F(e) = F(h) * cos 80 degrees F(e) = 249.5 N * cos 80 degrees F(e) = 41.6 N The cord stretched 11 cm (0.11 m) So the "Force Constant" on the cord would be: K = 41.6 N / (0.11 m) K = 378.2 N/m (or 3.782 N/cm) I hope that this helped you Good Luck laurenzo
Help with physics homework? Help i am really really stuck!?
1.A ball is thrown upward with an initial vertical speed of v0 to a maximum height of hmax.What is its initial vertical speed v0? The acceleration of gravity is g. Neglect air resistance. 2.A basketball player achieves a hang time of 1.04 s in dunking the ball. What vertical height will he attain? The acceleration of gravity is 9.8 m/s 2 . Answer in units of m 3.The tallest volcano in the solar system is the 30 km tall Martian volcano, Olympus Mons. An astronaut drops a ball off the rim of the crater and that the free fall acceleration of the ball remains constant throughout the ball’s 30 km fall at a value of 4.5 m/s 2 . (We assume that the crater is as deep as the volcano is tall, which is not usually the case in nature.) Find the time for the ball to reach the crater floor. Answer in units of s
Can anyone help me with my Physics homework? I am really stuck!?
The cell has a potential difference of 2.0 V and the resistor has a resistance of 5.0 Ω. The ammeter reading is 0.9 A. i) Show the the current through the resistor is 0.4 A. ii) The ammeter reading is 0.9 A. Calculate the current through the lamp. iii) Calculate the resistance of the lamp in this circuit.
Anyone an expert at Physics if so im stuck on my Physics homework please?
Q1...The heat of the gas flame is rising as the density of the hot gases and heated air decreases. As the heat is given up to the potatoes and the skewers, the temperature of the hot gases decreases and the density increases causing the gases to fall again. This rising and falling of the gases is called 'Convection Currents' that maintain the heat evenly throughout the oven.The metal skeweres piercing the potatoes absorb a lot of heat energy. This is carried by conduction within the metal into the interior of the potatoes thereby assisting in the cooking process Q2...The shaking of the tray causes the marbles to move around erratically resulting in excitation (Increase in Kinetic Energy) of the marbles and many collisions between them. This causes some of them to jump out of the tray. This action is emulating the action of the molecules of water when heated to boiling and vaporisation. The molecules of water as steam, are escaping the liquid due to the increase in Kinetic Energy. Q3....The alcohol on the skin is very volatile and is quickly evaporating. Evaporation requires addition of Latent Heat energy. This is removed from the skin as Sensible Heat thereby causing cooling of the skin as the alcohol evaporates.
Can I get physics homework help online?
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Basic Physics problem?
Just use the equation for kinetic energy: KE=(1/2)mv^2 Let m=mass of father, v=velocity of father, u=velocity of son Original KE of father = (1/2)mv^2 Original KE of son = (1/2)(1/3)mu^2=(1/6)mu^2 Given that KE(father)=(1/2)KE(son) we see, (1/2)mv^2=(1/2)(1/6)mu^2 which you can simplify to find v^2=(1/6)u^2 (call this equation *) Now, when the father speeds up his KE changes to =(1/2)m(v+1.8)^2 Which again equals the son's so we have (1/2)m(v+1.8)^2=(1/6)mu^2 Now you can plug the v (*) we found above into this new equation to solve for u And once you have u you can easily calculate v from (*). Hope this helps!
Physics Homework Help, Please anyone ?
It says that an electric kettle has a power rating of 2kW and operates from the mains. It ask me firstly to calculate the resistance of the kettle heating element. It then asks me to calculate the current flowing through the kettle's heating element when it is working properly. I am very stuck with this physics homework. I can't ask my teacher for help as he just shouts at me. The power supply in the UK is 230V if this helps any towards the question. But help would be very nice, 10 points ?